Revert 132934 - this change seems to break many webgl related layout tests

gpu/command_buffer/client/gles2_implementation_autogen.h

 // Copyright (c) 2012 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
 // DO NOT EDIT!
 
 // This file is included by gles2_implementation.h to declare the
 // GL api functions.
@@ skipping 1528 matching lines @@
     return;
   }
   if (height < 0) {
     SetGLError(GL_INVALID_VALUE, "glTexImageIOSurface2DCHROMIUM: height < 0");
     return;
   }
   helper_->TexImageIOSurface2DCHROMIUM(
       target, width, height, ioSurfaceId, plane);
 }
 
-void CopyTextureCHROMIUM(
-    GLenum target, GLenum source_id, GLenum dest_id, GLint level) {
-  GPU_CLIENT_SINGLE_THREAD_CHECK();
-  GPU_CLIENT_LOG("[" << this << "] glCopyTextureCHROMIUM(" << GLES2Util::GetStringEnum(target) << ", " << GLES2Util::GetStringEnum(source_id) << ", " << GLES2Util::GetStringEnum(dest_id) << ", " << level << ")");  // NOLINT
-  helper_->CopyTextureCHROMIUM(target, source_id, dest_id, level);
-}
-
 void DrawArraysInstancedANGLE(
     GLenum mode, GLint first, GLsizei count, GLsizei primcount);
 
 void DrawElementsInstancedANGLE(
     GLenum mode, GLsizei count, GLenum type, const void* indices,
     GLsizei primcount);
 
 void VertexAttribDivisorANGLE(GLuint index, GLuint divisor);
 
 #endif  // GPU_COMMAND_BUFFER_CLIENT_GLES2_IMPLEMENTATION_AUTOGEN_H_