Delete blink::WebGraphicsContext3D and cc_blink::ContextProviderWebContext

third_party/WebKit/public/blink_headers.gypi

 # Copyright 2015 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.
 
 {
   'variables': {
     'blink_public_sources': [
       "platform/callback/WebClosure.h",
       "platform/Platform.h",
       "platform/FilePathConversion.h",
@@ skipping 84 matching lines @@
       "platform/WebGamepad.h",
       "platform/WebGamepadListener.h",
       "platform/WebGamepads.h",
       "platform/WebGeofencingError.h",
       "platform/WebGeofencingEventType.h",
       "platform/WebGeofencingProvider.h",
       "platform/WebGeofencingRegistration.h",
       "platform/WebGestureCurve.h",
       "platform/WebGestureCurveTarget.h",
       "platform/WebGestureDevice.h",
-      "platform/WebGraphicsContext3D.h",
       "platform/WebGraphicsContext3DProvider.h",
       "platform/WebHTTPBody.h",
       "platform/WebHTTPHeaderVisitor.h",
       "platform/WebHTTPLoadInfo.h",
       "platform/WebHistoryScrollRestorationType.h",
       "platform/WebImage.h",
       "platform/WebImageGenerator.h",
       "platform/WebImageLayer.h",
       "platform/WebInbandTextTrack.h",
       "platform/WebInbandTextTrackClient.h",
@@ skipping 375 matching lines @@
       "web/modules/serviceworker/WebServiceWorkerContextClient.h",
       "web/modules/serviceworker/WebServiceWorkerContextProxy.h",
       "web/modules/serviceworker/WebServiceWorkerNetworkProvider.h",
       "web/modules/webmidi/WebMIDIClient.h",
       "web/modules/webmidi/WebMIDIOptions.h",
       "web/modules/webmidi/WebMIDIPermissionRequest.h",
       "web/win/WebFontRendering.h",
     ],
   },
 }