Removing GL context rate limiting feature and related wrappers

gpu/command_buffer/client/gles2_implementation_autogen.h

 // 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.
 
 // This file is auto-generated from
 // gpu/command_buffer/build_gles2_cmd_buffer.py
 // It's formatted by clang-format using chromium coding style:
 //    clang-format -i -style=chromium filename
 // DO NOT EDIT!
 
@@ skipping 858 matching lines @@
                                GLenum access) override;
 
 void UnmapTexSubImage2DCHROMIUM(const void* mem) override;
 
 void ResizeCHROMIUM(GLuint width, GLuint height, GLfloat scale_factor) override;
 
 const GLchar* GetRequestableExtensionsCHROMIUM() override;
 
 void RequestExtensionCHROMIUM(const char* extension) override;
 
-void RateLimitOffscreenContextCHROMIUM() override;
-
 void GetProgramInfoCHROMIUM(GLuint program,
                             GLsizei bufsize,
                             GLsizei* size,
                             void* info) override;
 
 void GetUniformBlocksCHROMIUM(GLuint program,
                               GLsizei bufsize,
                               GLsizei* size,
                               void* info) override;
 
@@ skipping 203 matching lines @@
                                         GLuint mask,
                                         GLenum coverMode) override;
 
 GLenum GetGraphicsResetStatusKHR() override;
 
 void BlendBarrierKHR() override;
 
 void ApplyScreenSpaceAntialiasingCHROMIUM() override;
 
 #endif  // GPU_COMMAND_BUFFER_CLIENT_GLES2_IMPLEMENTATION_AUTOGEN_H_