Revert of Enable DirectComposition by default.

content/browser/gpu/gpu_data_manager_impl_private.cc

 // Copyright (c) 2013 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 "content/browser/gpu/gpu_data_manager_impl_private.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/command_line.h"
 #include "base/metrics/field_trial.h"
@@ skipping 641 matching lines @@
   DCHECK(command_line);
 
   std::string use_gl =
       base::CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
           switches::kUseGL);
   base::FilePath swiftshader_path =
       base::CommandLine::ForCurrentProcess()->GetSwitchValuePath(
           switches::kSwiftShaderPath);
   if (gpu_driver_bugs_.find(gpu::DISABLE_D3D11) != gpu_driver_bugs_.end())
     command_line->AppendSwitch(switches::kDisableD3D11);
-  if (gpu_driver_bugs_.find(gpu::DISABLE_DIRECT_COMPOSITION) !=
-      gpu_driver_bugs_.end())
-    command_line->AppendSwitch(switches::kDisableDirectComposition);
   if (use_swiftshader_) {
     command_line->AppendSwitchASCII(switches::kUseGL, "swiftshader");
     if (swiftshader_path.empty())
       swiftshader_path = swiftshader_path_;
   } else if ((IsFeatureBlacklisted(gpu::GPU_FEATURE_TYPE_WEBGL) ||
               IsFeatureBlacklisted(gpu::GPU_FEATURE_TYPE_GPU_COMPOSITING) ||
               IsFeatureBlacklisted(
                   gpu::GPU_FEATURE_TYPE_ACCELERATED_2D_CANVAS)) &&
              (use_gl == "any")) {
     command_line->AppendSwitchASCII(
@@ skipping 570 matching lines @@
   gpu_info_.context_info_state = gpu::kCollectInfoFatalFailure;
 #if defined(OS_WIN)
   gpu_info_.dx_diagnostics_info_state = gpu::kCollectInfoFatalFailure;
 #endif
   complete_gpu_info_already_requested_ = true;
   // Some observers might be waiting.
   NotifyGpuInfoUpdate();
 }
 
 }  // namespace content