Convert some audio code to OnceCallback.

content/browser/renderer_host/media/media_stream_dispatcher_host_unittest.cc

Index: content/browser/renderer_host/media/media_stream_dispatcher_host_unittest.cc
diff --git a/content/browser/renderer_host/media/media_stream_dispatcher_host_unittest.cc b/content/browser/renderer_host/media/media_stream_dispatcher_host_unittest.cc
index 6e4837718aa1d775d0f161b54f6a9a241d54c446..96c5f6ed957d628a5cd8585c6fe11ff06f641948 100644
--- a/content/browser/renderer_host/media/media_stream_dispatcher_host_unittest.cc
+++ b/content/browser/renderer_host/media/media_stream_dispatcher_host_unittest.cc
@@ -232,10 +232,18 @@ class MockMediaStreamDispatcherHost : public MediaStreamDispatcherHost,
 
 class MockMediaStreamUIProxy : public FakeMediaStreamUIProxy {
  public:
-  MOCK_METHOD2(
-      OnStarted,
-      void(const base::Closure& stop,
-           const MediaStreamUIProxy::WindowIdCallback& window_id_callback));
+  void OnStarted(
+      base::OnceClosure stop,
+      MediaStreamUIProxy::WindowIdCallback window_id_callback) override {
+    // gmock cannot handle move-only types:
+    MockOnStarted(
+        base::Bind(&MockMediaStreamUIProxy::RunOnce, base::Passed(&stop)));
+  }
+
+  MOCK_METHOD1(MockOnStarted, void(base::Closure stop));
+
+ private:
+  static void RunOnce(base::OnceClosure cl) { std::move(cl).Run(); }
 };
 
 class MediaStreamDispatcherHostTest : public testing::Test {
@@ -323,7 +331,7 @@ class MediaStreamDispatcherHostTest : public testing::Test {
   virtual void SetupFakeUI(bool expect_started) {
     stream_ui_ = new MockMediaStreamUIProxy();
     if (expect_started) {
-      EXPECT_CALL(*stream_ui_, OnStarted(_, _));
+      EXPECT_CALL(*stream_ui_, MockOnStarted(_));
     }
     media_stream_manager_->UseFakeUIForTests(
         std::unique_ptr<FakeMediaStreamUIProxy>(stream_ui_));
@@ -830,7 +838,7 @@ TEST_F(MediaStreamDispatcherHostTest, CloseFromUI) {
   base::Closure close_callback;
   std::unique_ptr<MockMediaStreamUIProxy> stream_ui(
       new MockMediaStreamUIProxy());
-  EXPECT_CALL(*stream_ui, OnStarted(_, _))
+  EXPECT_CALL(*stream_ui, MockOnStarted(_))
       .WillOnce(SaveArg<0>(&close_callback));
   media_stream_manager_->UseFakeUIForTests(std::move(stream_ui));