diff --git a/android_webview/common/aw_features.cc b/android_webview/common/aw_features.cc
index 46381dbe7e5527..62bd8a4a1946de 100644
--- a/android_webview/common/aw_features.cc
+++ b/android_webview/common/aw_features.cc
@@ -27,7 +27,7 @@ const base::Feature kWebViewDisplayCutout{"WebViewDisplayCutout",
 // occurs. kWebViewExtraHeadersSameOriginOnly is stricter; when that's enabled,
 // this feature has no effect.
 const base::Feature kWebViewExtraHeadersSameDomainOnly{
-    "WebViewExtraHeadersSameDomainOnly", base::FEATURE_DISABLED_BY_DEFAULT};
+    "WebViewExtraHeadersSameDomainOnly", base::FEATURE_ENABLED_BY_DEFAULT};
 
 // Only allow extra headers added via loadUrl() to be sent to the original
 // origin; strip them from the request if a cross-origin redirect occurs.
diff --git a/testing/variations/fieldtrial_testing_config.json b/testing/variations/fieldtrial_testing_config.json
index 42d26252cd00f5..9069f6337fe60c 100644
--- a/testing/variations/fieldtrial_testing_config.json
+++ b/testing/variations/fieldtrial_testing_config.json
@@ -8056,21 +8056,6 @@
             ]
         }
     ],
-    "WebViewHeaderInjection": [
-        {
-            "platforms": [
-                "android_webview"
-            ],
-            "experiments": [
-                {
-                    "name": "SameDomainOnly",
-                    "enable_features": [
-                        "WebViewExtraHeadersSameDomainOnly"
-                    ]
-                }
-            ]
-        }
-    ],
     "WebViewZeroCopyVideo": [
         {
             "platforms": [
diff --git a/tools/metrics/histograms/histograms_xml/android/histograms.xml b/tools/metrics/histograms/histograms_xml/android/histograms.xml
index 32e1168a44c142..d0998757e320ff 100644
--- a/tools/metrics/histograms/histograms_xml/android/histograms.xml
+++ b/tools/metrics/histograms/histograms_xml/android/histograms.xml
@@ -2369,7 +2369,7 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
 </histogram>
 
 <histogram name="Android.WebView.ExtraHeadersRedirect"
-    enum="WebViewExtraHeadersRedirect" expires_after="2020-12-01">
+    enum="WebViewExtraHeadersRedirect" expires_after="2021-02-14">
   <owner>torne@chromium.org</owner>
   <owner>src/android_webview/OWNERS</owner>
   <summary>