Revert of Allow creating GLImage-backed textures with glTexStorage2D.

gpu/command_buffer/service/texture_manager.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.
 
 #ifndef GPU_COMMAND_BUFFER_SERVICE_TEXTURE_MANAGER_H_
 #define GPU_COMMAND_BUFFER_SERVICE_TEXTURE_MANAGER_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 147 matching lines @@
   }
 
   GLenum wrap_t() const {
     return sampler_state_.wrap_t;
   }
 
   GLenum usage() const {
     return usage_;
   }
 
-  GLint buffer_usage() const { return buffer_usage_; }
-
   GLenum compare_func() const {
     return sampler_state_.compare_func;
   }
 
   GLenum compare_mode() const {
     return sampler_state_.compare_mode;
   }
 
   GLfloat max_lod() const {
     return sampler_state_.max_lod;
@@ skipping 427 matching lines @@
 
   // Texture parameters.
   SamplerState sampler_state_;
   GLenum usage_;
   GLint base_level_;
   GLint max_level_;
   GLenum swizzle_r_;
   GLenum swizzle_g_;
   GLenum swizzle_b_;
   GLenum swizzle_a_;
-  GLint buffer_usage_ = GL_NONE;
 
   // The maximum level that has been set.
   GLint max_level_set_;
 
   // Whether or not this texture is "texture complete"
   bool texture_complete_;
 
   // Whether or not this texture is "cube complete"
   bool cube_complete_;
 
@@ skipping 627 matching lines @@
 
   ServiceDiscardableManager* discardable_manager_;
 
   DISALLOW_COPY_AND_ASSIGN(TextureManager);
 };
 
 }  // namespace gles2
 }  // namespace gpu
 
 #endif  // GPU_COMMAND_BUFFER_SERVICE_TEXTURE_MANAGER_H_