diff --git a/.gn b/.gn
index 3a4299fe6b32e9..05029df877d922 100644
--- a/.gn
+++ b/.gn
@@ -38,11 +38,9 @@ default_args = {
     "//third_party/WebKit/Source/core/streams/ByteLengthQueuingStrategy.js",
     "//third_party/WebKit/Source/core/streams/CountQueuingStrategy.js",
     "//third_party/WebKit/Source/core/streams/ReadableStream.js",
-  ]
-  v8_experimental_extra_library_files = [
-    "//third_party/WebKit/Source/core/streams/ReadableStreamExperimentalPipeTo.js",
     "//third_party/WebKit/Source/core/streams/WritableStream.js",
   ]
+  v8_experimental_extra_library_files = [ "//third_party/WebKit/Source/core/streams/ReadableStreamExperimentalPipeTo.js" ]
   v8_enable_inspector = true
   v8_enable_gdbjit = false
   v8_imminent_deprecation_warnings = false
diff --git a/third_party/WebKit/LayoutTests/platform/mac/virtual/stable/webexposed/global-interface-listing-expected.txt b/third_party/WebKit/LayoutTests/platform/mac/virtual/stable/webexposed/global-interface-listing-expected.txt
index 6b443e5ff0ce52..3bfe6390ecafcd 100644
--- a/third_party/WebKit/LayoutTests/platform/mac/virtual/stable/webexposed/global-interface-listing-expected.txt
+++ b/third_party/WebKit/LayoutTests/platform/mac/virtual/stable/webexposed/global-interface-listing-expected.txt
@@ -7257,6 +7257,11 @@ interface Worker : EventTarget
     method terminate
     setter onerror
     setter onmessage
+interface WritableStream
+    getter locked
+    method abort
+    method constructor
+    method getWriter
 interface XMLDocument : Document
     attribute @@toStringTag
     method constructor
diff --git a/third_party/WebKit/LayoutTests/platform/win/virtual/stable/webexposed/global-interface-listing-expected.txt b/third_party/WebKit/LayoutTests/platform/win/virtual/stable/webexposed/global-interface-listing-expected.txt
index 5db616beb299bc..09776d4806b318 100644
--- a/third_party/WebKit/LayoutTests/platform/win/virtual/stable/webexposed/global-interface-listing-expected.txt
+++ b/third_party/WebKit/LayoutTests/platform/win/virtual/stable/webexposed/global-interface-listing-expected.txt
@@ -7185,6 +7185,11 @@ interface Worker : EventTarget
     method terminate
     setter onerror
     setter onmessage
+interface WritableStream
+    getter locked
+    method abort
+    method constructor
+    method getWriter
 interface XMLDocument : Document
     attribute @@toStringTag
     method constructor
diff --git a/third_party/WebKit/LayoutTests/virtual/stable/http/tests/serviceworker/webexposed/global-interface-listing-service-worker-expected.txt b/third_party/WebKit/LayoutTests/virtual/stable/http/tests/serviceworker/webexposed/global-interface-listing-service-worker-expected.txt
index 0d4416766c4d53..3157bebffbfcf7 100644
--- a/third_party/WebKit/LayoutTests/virtual/stable/http/tests/serviceworker/webexposed/global-interface-listing-service-worker-expected.txt
+++ b/third_party/WebKit/LayoutTests/virtual/stable/http/tests/serviceworker/webexposed/global-interface-listing-service-worker-expected.txt
@@ -678,6 +678,11 @@ interface WorkerNavigator
     getter storage
     getter userAgent
     method constructor
+interface WritableStream
+    getter locked
+    method abort
+    method constructor
+    method getWriter
 global object
     attribute console
     attribute internals
diff --git a/third_party/WebKit/LayoutTests/virtual/stable/webexposed/global-interface-listing-dedicated-worker-expected.txt b/third_party/WebKit/LayoutTests/virtual/stable/webexposed/global-interface-listing-dedicated-worker-expected.txt
index 8340ed27f1929b..83676dcde8a19d 100644
--- a/third_party/WebKit/LayoutTests/virtual/stable/webexposed/global-interface-listing-dedicated-worker-expected.txt
+++ b/third_party/WebKit/LayoutTests/virtual/stable/webexposed/global-interface-listing-dedicated-worker-expected.txt
@@ -688,6 +688,11 @@ Starting worker: resources/global-interface-listing.js
 [Worker]     getter storage
 [Worker]     getter userAgent
 [Worker]     method constructor
+[Worker] interface WritableStream
+[Worker]     getter locked
+[Worker]     method abort
+[Worker]     method constructor
+[Worker]     method getWriter
 [Worker] interface XMLHttpRequest : XMLHttpRequestEventTarget
 [Worker]     attribute @@toStringTag
 [Worker]     attribute DONE
diff --git a/third_party/WebKit/LayoutTests/virtual/stable/webexposed/global-interface-listing-shared-worker-expected.txt b/third_party/WebKit/LayoutTests/virtual/stable/webexposed/global-interface-listing-shared-worker-expected.txt
index 8078069df986ea..e3c0b933fb0004 100644
--- a/third_party/WebKit/LayoutTests/virtual/stable/webexposed/global-interface-listing-shared-worker-expected.txt
+++ b/third_party/WebKit/LayoutTests/virtual/stable/webexposed/global-interface-listing-shared-worker-expected.txt
@@ -688,6 +688,11 @@ Starting worker: resources/global-interface-listing.js
 [Worker]     getter storage
 [Worker]     getter userAgent
 [Worker]     method constructor
+[Worker] interface WritableStream
+[Worker]     getter locked
+[Worker]     method abort
+[Worker]     method constructor
+[Worker]     method getWriter
 [Worker] interface XMLHttpRequest : XMLHttpRequestEventTarget
 [Worker]     attribute @@toStringTag
 [Worker]     attribute DONE