Removed implementation of CHROMIUM_subscribe_uniform

gpu/command_buffer/service/gpu_preferences.h

 // Copyright 2016 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.
 
 #ifndef GPU_COMMAND_BUFFER_SERVICE_GPU_PREFERENCES_H_
 #define GPU_COMMAND_BUFFER_SERVICE_GPU_PREFERENCES_H_
 
 #include <stddef.h>
 
 #include "base/macros.h"
@@ skipping 79 matching lines @@
 
   // Sets the maximum size of the in-memory gpu program cache, in kb
   uint32_t gpu_program_cache_size = kDefaultMaxProgramCacheMemoryBytes;
 
   // Disables the GPU shader on disk cache.
   bool disable_gpu_shader_disk_cache = false;
 
   // Allows async texture uploads (off main thread) via GL context sharing.
   bool enable_share_group_async_texture_upload = false;
 
-  // Enable WebGL subscribe uniform extension.
-  bool enable_subscribe_uniform_extension = false;
-
   // Simulates shared textures when share groups are not available.
   // Not available everywhere.
   bool enable_threaded_texture_mailboxes = false;
 
   // Include ANGLE's intermediate representation (AST) output in shader
   // compilation info logs.
   bool gl_shader_interm_output = false;
 
   // Emulate ESSL lowp and mediump float precisions by mutating the shaders to
   // round intermediate values in ANGLE.
   bool emulate_shader_precision = false;
 
   // ===================================
   // Settings from //ui/gl/gl_switches.h
 
   // Turns on GPU logging (debug build only).
   bool enable_gpu_service_logging = false;
 
   // Turns on calling TRACE for every GL call.
   bool enable_gpu_service_tracing = false;
 
   // Enable OpenGL ES 3 APIs without proper service side validation.
   bool enable_unsafe_es3_apis = false;
 };
 
 }  // namespace gpu
 
 #endif // GPU_COMMAND_BUFFER_SERVICE_GPU_PREFERENCES_H_