[fuchsia] Rename .cmx files for specific unit tests to .test-cmx

These unit tests have their own CMX files that enable running
hermetically with run-test-component.

As discussed in the bug, these don't need security review, and renaming
them avoids the presubmit check when maintaining them.

Also remove OWNERS rules that applied only to the renamed files.

Bug: 1132878
Change-Id: I3f211584d164e99455e98c3837ec3cea80c50910
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2482028
Reviewed-by: John Rummell <jrummell@chromium.org>
Reviewed-by: Wez <wez@chromium.org>
Commit-Queue: John Rummell <jrummell@chromium.org>
Auto-Submit: David Dorwin <ddorwin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#821091}

base/BUILD.gn

@@ -3348,7 +3348,7 @@ test("base_unittests") {
       "//third_party/fuchsia-sdk/sdk/pkg/sys_cpp",
     ]
 
-    manifest = "fuchsia/base_unittests.cmx"
+    manifest = "fuchsia/base_unittests.test-cmx"
   }
 
   if (!is_fuchsia && !is_ios) {

base/fuchsia/OWNERS

@@ -3,6 +3,3 @@ file://build/fuchsia/OWNERS
 # FilteredServiceDirectory is part of the Fuchsia sandbox.
 per-file filtered_service_directory.*=set noparent
 per-file filtered_service_directory.*=file://fuchsia/SECURITY_OWNERS
-
-per-file *.cmx=set noparent
-per-file *.cmx=file://fuchsia/SECURITY_OWNERS

media/BUILD.gn

@@ -192,7 +192,7 @@ test("media_unittests") {
       "//media/fuchsia/audio:unittests",
       "//media/fuchsia/cdm/service:unittests",
     ]
-    manifest = "//media/fuchsia/media_unittests.cmx"
+    manifest = "//media/fuchsia/media_unittests.test-cmx"
   }
 
   if (enable_media_remoting) {

media/fuchsia/OWNERS

@@ -1,6 +1,3 @@
 sergeyu@chromium.org
-yucliu@chromium.org
 wez@chromium.org
-
-per-file *.cmx=set noparent
-per-file *.cmx=file://fuchsia/SECURITY_OWNERS
+yucliu@chromium.org