Revert of gpu: Expose internal format R8 instead of RED.

gpu/command_buffer/tests/gl_gpu_memory_buffer_unittest.cc

 // 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.
 
 #include <GLES2/gl2.h>
 #include <GLES2/gl2chromium.h>
 #include <GLES2/gl2ext.h>
 #include <GLES2/gl2extchromium.h>
 #include <stdint.h>
 
@@ skipping 110 matching lines @@
       NOTREACHED();
       return;
   }
 
   NOTREACHED();
 }
 
 GLenum InternalFormat(gfx::BufferFormat format) {
   switch (format) {
     case gfx::BufferFormat::R_8:
-      return GL_R8;
+      return GL_RED;
     case gfx::BufferFormat::RGBA_4444:
     case gfx::BufferFormat::RGBA_8888:
       return GL_RGBA;
     case gfx::BufferFormat::BGRA_8888:
       return GL_BGRA_EXT;
     case gfx::BufferFormat::ATC:
     case gfx::BufferFormat::ATCIA:
     case gfx::BufferFormat::BGRX_8888:
     case gfx::BufferFormat::DXT1:
     case gfx::BufferFormat::DXT5:
@@ skipping 96 matching lines @@
 
 INSTANTIATE_TEST_CASE_P(GpuMemoryBufferTests,
                         GpuMemoryBufferTest,
                         ::testing::Values(gfx::BufferFormat::R_8,
                                           gfx::BufferFormat::RGBA_4444,
                                           gfx::BufferFormat::RGBA_8888,
                                           gfx::BufferFormat::BGRA_8888));
 
 }  // namespace gles2
 }  // namespace gpu