Convert //cc from scoped_ptr to std::unique_ptr.

cc/test/threaded_channel_for_test.h

Index: cc/test/threaded_channel_for_test.h
diff --git a/cc/test/threaded_channel_for_test.h b/cc/test/threaded_channel_for_test.h
index 6a47d10cfb990567f9c3ff1101d7001e703ae61b..f48423a0ce060a6d56cbfa3a2b2d9a9d8f8fcc79 100644
--- a/cc/test/threaded_channel_for_test.h
+++ b/cc/test/threaded_channel_for_test.h
@@ -15,7 +15,7 @@ class ProxyImplForTest;
 // ThreadedChannel that notifies |test_hooks| of internal actions by ProxyImpl.
 class ThreadedChannelForTest : public ThreadedChannel {
  public:
-  static scoped_ptr<ThreadedChannelForTest> Create(
+  static std::unique_ptr<ThreadedChannelForTest> Create(
       TestHooks* test_hooks,
       ProxyMain* proxy_main,
       TaskRunnerProvider* task_runner_provider);
@@ -27,11 +27,11 @@ class ThreadedChannelForTest : public ThreadedChannel {
                          ProxyMain* proxy_main,
                          TaskRunnerProvider* task_runner_provider);
 
-  scoped_ptr<ProxyImpl> CreateProxyImpl(
+  std::unique_ptr<ProxyImpl> CreateProxyImpl(
       ChannelImpl* channel_impl,
       LayerTreeHost* layer_tree_host,
       TaskRunnerProvider* task_runner_provider,
-      scoped_ptr<BeginFrameSource> external_begin_frame_source) override;
+      std::unique_ptr<BeginFrameSource> external_begin_frame_source) override;
 
   TestHooks* test_hooks_;
   ProxyImplForTest* proxy_impl_for_test_;