cc: Make OutputSurface::BindToClient pure virtual and not return bool

content/browser/compositor/software_browser_compositor_output_surface_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 "content/browser/compositor/software_browser_compositor_output_surface.h"
 
 #include <utility>
 
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
@@ skipping 100 matching lines @@
   return base::MakeUnique<content::SoftwareBrowserCompositorOutputSurface>(
       std::move(device), compositor_->vsync_manager(), &begin_frame_source_,
       base::ThreadTaskRunnerHandle::Get());
 }
 
 TEST_F(SoftwareBrowserCompositorOutputSurfaceTest, NoVSyncProvider) {
   cc::FakeOutputSurfaceClient output_surface_client;
   std::unique_ptr<cc::SoftwareOutputDevice> software_device(
       new cc::SoftwareOutputDevice());
   output_surface_ = CreateSurface(std::move(software_device));
-  CHECK(output_surface_->BindToClient(&output_surface_client));
+  output_surface_->BindToClient(&output_surface_client);
 
   output_surface_->SwapBuffers(cc::OutputSurfaceFrame());
   EXPECT_EQ(NULL, output_surface_->software_device()->GetVSyncProvider());
 }
 
 TEST_F(SoftwareBrowserCompositorOutputSurfaceTest, VSyncProviderUpdates) {
   cc::FakeOutputSurfaceClient output_surface_client;
   std::unique_ptr<cc::SoftwareOutputDevice> software_device(
       new FakeSoftwareOutputDevice());
   output_surface_ = CreateSurface(std::move(software_device));
-  CHECK(output_surface_->BindToClient(&output_surface_client));
+  output_surface_->BindToClient(&output_surface_client);
 
   FakeVSyncProvider* vsync_provider = static_cast<FakeVSyncProvider*>(
       output_surface_->software_device()->GetVSyncProvider());
   EXPECT_EQ(0, vsync_provider->call_count());
 
   output_surface_->SwapBuffers(cc::OutputSurfaceFrame());
   EXPECT_EQ(1, vsync_provider->call_count());
 }