Replace WaitableEvents and ConditionalVariables in VideoRendererBase tests with MessageLoop.

media/base/mock_callback.cc

Index: media/base/mock_callback.cc
diff --git a/media/base/mock_callback.cc b/media/base/mock_callback.cc
index e9d2da356b14c1076697401e1817ecb6a7396c01..522259df79cf22166a7bbc7447e4bcb1acb3a35b 100644
--- a/media/base/mock_callback.cc
+++ b/media/base/mock_callback.cc
@@ -5,6 +5,7 @@
 #include "media/base/mock_callback.h"
 
 #include "base/bind.h"
+#include "base/message_loop.h"
 
 using ::testing::_;
 using ::testing::StrictMock;
@@ -33,11 +34,25 @@ class MockStatusCB : public base::RefCountedThreadSafe<MockStatusCB> {
   DISALLOW_COPY_AND_ASSIGN(MockStatusCB);
 };
 
-base::Callback<void(PipelineStatus)> NewExpectedStatusCB(
-    PipelineStatus status) {
+PipelineStatusCB NewExpectedStatusCB(PipelineStatus status) {
   StrictMock<MockStatusCB>* callback = new StrictMock<MockStatusCB>();
   EXPECT_CALL(*callback, Run(status));
   return base::Bind(&MockStatusCB::Run, callback);
 }
 
+static void RunStatusCBAndQuit(
+    const scoped_refptr<base::MessageLoopProxy> message_loop,
+    PipelineStatusCB status_cb,
+    PipelineStatus status) {
+  status_cb.Run(status);
+  message_loop->PostTask(FROM_HERE, MessageLoop::QuitWhenIdleClosure());
+}
+
+PipelineStatusCB NewExpectedStatusAndQuitCB(PipelineStatus status) {
+  StrictMock<MockStatusCB>* callback = new StrictMock<MockStatusCB>();
+  EXPECT_CALL(*callback, Run(status));
+  return base::Bind(&RunStatusCBAndQuit, base::MessageLoopProxy::current(),
+                    base::Bind(&MockStatusCB::Run, callback));
+}
+
 }  // namespace media