Convert //content from scoped_ptr to std::unique_ptr

content/test/fake_compositor_dependencies.h

Index: content/test/fake_compositor_dependencies.h
diff --git a/content/test/fake_compositor_dependencies.h b/content/test/fake_compositor_dependencies.h
index c9f6ed27e8021f141eddd76ecdc172da95b93265..5aa31e727445a2925af996289c21050f8d5883f0 100644
--- a/content/test/fake_compositor_dependencies.h
+++ b/content/test/fake_compositor_dependencies.h
@@ -38,7 +38,7 @@ class FakeCompositorDependencies : public CompositorDependencies {
   gpu::GpuMemoryBufferManager* GetGpuMemoryBufferManager() override;
   scheduler::RendererScheduler* GetRendererScheduler() override;
   cc::ContextProvider* GetSharedMainThreadContextProvider() override;
-  scoped_ptr<cc::BeginFrameSource> CreateExternalBeginFrameSource(
+  std::unique_ptr<cc::BeginFrameSource> CreateExternalBeginFrameSource(
       int routing_id) override;
   cc::ImageSerializationProcessor* GetImageSerializationProcessor() override;
   cc::TaskGraphRunner* GetTaskGraphRunner() override;