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

cc/output/software_renderer_unittest.cc

 // Copyright 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 "cc/output/software_renderer.h"
 
 #include <stdint.h>
 
 #include "base/bind.h"
 #include "base/memory/ptr_util.h"
@@ skipping 20 matching lines @@
 
 namespace cc {
 namespace {
 
 class SoftwareRendererTest : public testing::Test {
  public:
   void InitializeRenderer(
       std::unique_ptr<SoftwareOutputDevice> software_output_device) {
     output_surface_ =
         FakeOutputSurface::CreateSoftware(std::move(software_output_device));
-    CHECK(output_surface_->BindToClient(&output_surface_client_));
+    output_surface_->BindToClient(&output_surface_client_);
 
     shared_bitmap_manager_.reset(new TestSharedBitmapManager());
     resource_provider_ =
         FakeResourceProvider::Create(nullptr, shared_bitmap_manager_.get());
     renderer_ = base::MakeUnique<SoftwareRenderer>(
         &settings_, output_surface_.get(), resource_provider());
     renderer_->Initialize();
     renderer_->SetVisible(true);
   }
 
@@ skipping 391 matching lines @@
                         viewport_size);
 
   // The damage rect should be reported to the SoftwareOutputDevice.
   EXPECT_EQ(gfx::Rect(2, 2, 3, 3), device->damage_rect_at_start());
   // The SkCanvas should be clipped to the damage rect.
   EXPECT_EQ(gfx::Rect(2, 2, 3, 3), device->clip_rect_at_end());
 }
 
 }  // namespace
 }  // namespace cc