Make sure MediaStreamManager handles requests in order.

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 9e060d497b8df527cb5a53b3b69b2b1038547ece..227f8cfb96d985ed6454ea572339ca55dcb7ac70 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
@@ -36,6 +36,7 @@
 using ::testing::_;
 using ::testing::DeleteArg;
 using ::testing::DoAll;
+using ::testing::InSequence;
 using ::testing::Return;
 using ::testing::SaveArg;
 
@@ -564,12 +565,15 @@ TEST_F(MediaStreamDispatcherHostTest, GenerateStreamsWithoutWaiting) {
 
   // Generate first stream.
   SetupFakeUI(true);
-  EXPECT_CALL(*host_.get(), OnStreamGenerated(kRenderId, kPageRequestId, 0, 1));
-
-  // Generate second stream.
-  EXPECT_CALL(*host_.get(),
-              OnStreamGenerated(kRenderId, kPageRequestId + 1, 0, 1));
-
+  {
+    InSequence s;
+    EXPECT_CALL(*host_.get(),
+                OnStreamGenerated(kRenderId, kPageRequestId, 0, 1));
+
+    // Generate second stream.
+    EXPECT_CALL(*host_.get(),
+                OnStreamGenerated(kRenderId, kPageRequestId + 1, 0, 1));
+  }
   base::RunLoop run_loop1;
   base::RunLoop run_loop2;
   host_->OnGenerateStream(kRenderId, kPageRequestId, options, origin_,