Revert "Add blink::features::CompositeSVG"

This reverts commit 4562b3f8.

Reason for revert: This prevents the blink feature from being tested
for web tests. Will land crrev.com/c/2369263 first. We may not reland
this CL if we decide not to go through field trial.

Original change's description:
> Add blink::features::CompositeSVG
> 
> It corresponds to blink::RuntimeEnabledFeatures::CompositeSVGEnabled().
> This is to allow perf tests with CompositeSVG enabled by default with a
> testing variation.
> 
> Bug: 1101002
> Change-Id: If9a92b9eb56d0b242d8a46e397df71faa01577e6
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2373398
> Reviewed-by: Chris Harrelson <chrishtr@chromium.org>
> Reviewed-by: Philip Rogers <pdr@chromium.org>
> Commit-Queue: Xianzhu Wang <wangxianzhu@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#801382}

TBR=wangxianzhu@chromium.org,pdr@chromium.org,chrishtr@chromium.org

Change-Id: I8546a075b9d850a53e9117d12731ee9fe1ae3d6f
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1101002
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2375996Reviewed-by: Xianzhu Wang <wangxianzhu@chromium.org>
Commit-Queue: Xianzhu Wang <wangxianzhu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#801623}

content/child/runtime_features.cc

@@ -341,7 +341,6 @@ void SetRuntimeFeaturesFromChromiumFeatures() {
     {wf::EnableMediaFeeds, media::kMediaFeeds, kUseFeatureState},
     {wf::EnableRestrictGamepadAccess, features::kRestrictGamepadAccess,
      kEnableOnly},
-    {wf::EnableCompositeSVG, blink::features::kCompositeSVG, kUseFeatureState},
     {wf::EnableCompositingOptimizations,
      blink::features::kCompositingOptimizations, kUseFeatureState},
     {wf::EnableConversionMeasurementInfraSupport,

third_party/blink/common/features.cc

@@ -692,11 +692,6 @@ bool IsParkableStringsToDiskEnabled() {
 const base::Feature kCrOSAutoSelect{"CrOSAutoSelect",
                                     base::FEATURE_DISABLED_BY_DEFAULT};
 
-// Enables compositing of eligible SVG elements to improve animation
-// performance. See crbug.com/1101002.
-const base::Feature kCompositeSVG{"CompositeSVG",
-                                  base::FEATURE_DISABLED_BY_DEFAULT};
-
 const base::Feature kCompositingOptimizations{
     "CompositingOptimizations", base::FEATURE_DISABLED_BY_DEFAULT};
 

third_party/blink/public/common/features.h

@@ -277,7 +277,6 @@ BLINK_COMMON_EXPORT bool IsParkableStringsToDiskEnabled();
 
 BLINK_COMMON_EXPORT extern const base::Feature kCrOSAutoSelect;
 
-BLINK_COMMON_EXPORT extern const base::Feature kCompositeSVG;
 BLINK_COMMON_EXPORT extern const base::Feature kCompositingOptimizations;
 
 BLINK_COMMON_EXPORT extern const base::Feature kReducedReferrerGranularity;

third_party/blink/public/platform/web_runtime_features.h

@@ -253,7 +253,6 @@ class WebRuntimeFeatures {
   BLINK_PLATFORM_EXPORT static void EnableConversionMeasurementInfraSupport(
       bool);
 
-  BLINK_PLATFORM_EXPORT static void EnableCompositeSVG(bool);
   BLINK_PLATFORM_EXPORT static void EnableCompositingOptimizations(bool);
 
  private:

third_party/blink/renderer/platform/exported/web_runtime_features.cc

@@ -717,10 +717,6 @@ void WebRuntimeFeatures::EnableRestrictGamepadAccess(bool enable) {
   RuntimeEnabledFeatures::SetRestrictGamepadAccessEnabled(enable);
 }
 
-void WebRuntimeFeatures::EnableCompositeSVG(bool enable) {
-  RuntimeEnabledFeatures::SetCompositeSVGEnabled(enable);
-}
-
 void WebRuntimeFeatures::EnableCompositingOptimizations(bool enable) {
   RuntimeEnabledFeatures::SetCompositingOptimizationsEnabled(enable);
 }