Revert of gpu: Add CHROMIUM_sync_query extension.

gpu/GLES2/gl2extchromium.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 contains Chromium-specific GLES2 extensions declarations.
 
 #ifndef GPU_GLES2_GL2EXTCHROMIUM_H_
 #define GPU_GLES2_GL2EXTCHROMIUM_H_
 
 #include <GLES2/gl2.h>
@@ skipping 674 matching lines @@
     GLint bounds_x,
     GLint bounds_y,
     GLint bounds_width,
     GLint bounds_height,
     GLfloat uv_x,
     GLfloat uv_y,
     GLfloat uv_width,
     GLfloat uv_height);
 #endif /* GL_CHROMIUM_schedule_overlay_plane */
 
-/* GL_CHROMIUM_sync_query */
-#ifndef GL_CHROMIUM_sync_query
-#define GL_CHROMIUM_sync_query 1
-
-#ifndef GL_COMMANDS_COMPLETED_CHROMIUM
-#define GL_COMMANDS_COMPLETED_CHROMIUM 0x84F7
-#endif
-#endif  /* GL_CHROMIUM_sync_query */
-
 #ifdef __cplusplus
 }
 #endif
 
 #endif  // GPU_GLES2_GL2EXTCHROMIUM_H_