Revert of ReadPixels with GL_HALF_FLOAT_OES when targetting all versions of ES.

gpu/command_buffer/service/gles2_cmd_decoder.cc

 // 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.
 
 #include "gpu/command_buffer/service/gles2_cmd_decoder.h"
 
 #include <limits.h>
 #include <stddef.h>
 #include <stdint.h>
 #include <stdio.h>
@@ skipping 10850 matching lines @@
     if (format == static_cast<GLenum>(preferred_format) &&
         type == static_cast<GLenum>(preferred_type)) {
       format_type_acceptable = true;
     }
   }
   if (!format_type_acceptable) {
     LOCAL_SET_GL_ERROR(GL_INVALID_OPERATION, "glReadPixels",
         "format and type incompatible with the current read framebuffer");
     return error::kNoError;
   }
-  if (type == GL_HALF_FLOAT_OES && !gl_version_info().is_es) {
+  if (type == GL_HALF_FLOAT_OES && !gl_version_info().is_es2) {
     type = GL_HALF_FLOAT;
   }
   if (width == 0 || height == 0) {
     return error::kNoError;
   }
 
   // Get the size of the current fbo or backbuffer.
   gfx::Size max_size = GetBoundReadFramebufferSize();
 
   int32_t max_x;
@@ skipping 7201 matching lines @@
 }
 
 // Include the auto-generated part of this file. We split this because it means
 // we can easily edit the non-auto generated parts right here in this file
 // instead of having to edit some template or the code generator.
 #include "base/macros.h"
 #include "gpu/command_buffer/service/gles2_cmd_decoder_autogen.h"
 
 }  // namespace gles2
 }  // namespace gpu