Revert of Allow canvases to be GPU-accelerated in Workers

third_party/WebKit/Source/platform/BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//testing/libfuzzer/fuzzer_test.gni")
 import("//testing/test.gni")
 import("//third_party/WebKit/Source/build/scripts/scripts.gni")
 import("//third_party/WebKit/Source/config.gni")
@@ skipping 1013 matching lines @@
     "graphics/filters/SpotLightSource.cpp",
     "graphics/filters/SpotLightSource.h",
     "graphics/gpu/AcceleratedImageBufferSurface.cpp",
     "graphics/gpu/AcceleratedImageBufferSurface.h",
     "graphics/gpu/DrawingBuffer.cpp",
     "graphics/gpu/DrawingBuffer.h",
     "graphics/gpu/Extensions3DUtil.cpp",
     "graphics/gpu/Extensions3DUtil.h",
     "graphics/gpu/SharedContextRateLimiter.cpp",
     "graphics/gpu/SharedContextRateLimiter.h",
-    "graphics/gpu/SharedGpuContext.cpp",
-    "graphics/gpu/SharedGpuContext.h",
     "graphics/gpu/WebGLImageConversion.cpp",
     "graphics/gpu/WebGLImageConversion.h",
     "graphics/paint/ClipDisplayItem.cpp",
     "graphics/paint/ClipDisplayItem.h",
     "graphics/paint/ClipPaintPropertyNode.h",
     "graphics/paint/ClipPathDisplayItem.cpp",
     "graphics/paint/ClipPathDisplayItem.h",
     "graphics/paint/ClipPathRecorder.cpp",
     "graphics/paint/ClipPathRecorder.h",
     "graphics/paint/ClipRecorder.cpp",
@@ skipping 1048 matching lines @@
     "//third_party/WebKit/Source:inside_blink",
   ]
 
   deps = [
     ":test_support",
     "//cc/surfaces:surface_id",
     "//testing/gmock",
     "//testing/gtest",
   ]
 }