Fix the flakiness of StopGeneratedStreamsOnChannelClosing on Android bot

content/browser/renderer_host/media/media_stream_dispatcher_host_unittest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <string>
 
 #include "base/bind.h"
 #include "base/message_loop.h"
 #include "content/browser/browser_thread_impl.h"
 #include "content/browser/renderer_host/media/audio_input_device_manager.h"
@@ skipping 354 matching lines @@
 TEST_F(MediaStreamDispatcherHostTest, StopGeneratedStreamsOnChannelClosing) {
   StreamOptions options(false, true);
 
   EXPECT_CALL(*host_, GetMediaObserver())
       .WillRepeatedly(Return(media_observer_.get()));
 
   // Create first group of streams.
   size_t generated_streams = 3;
   for (size_t i = 0; i < generated_streams; ++i) {
     EXPECT_CALL(*host_, OnStreamGenerated(kRenderId, kPageRequestId + i, 0, 1));
+    EXPECT_CALL(*media_observer_.get(), OnCaptureDevicesOpened(_, _, _));
     host_->OnGenerateStream(kPageRequestId + i, options);
+
+    // Wait until the stream is generated.
+    WaitForResult();
   }
   EXPECT_EQ(host_->NumberOfStreams(), generated_streams);
-  EXPECT_CALL(*media_observer_.get(), OnCaptureDevicesOpened(_, _, _))
-      .Times(3);
-  // Wait until the streams are all generated.
-  WaitForResult();
 
   // Calling OnChannelClosing() to cancel all the pending/generated streams.
   EXPECT_CALL(*media_observer_.get(), OnCaptureDevicesClosed(_, _, _))
       .Times(3);
   host_->OnChannelClosing();
 
   // Streams should have been cleaned up.
   EXPECT_EQ(host_->NumberOfStreams(), 0u);
 }
 
 };  // namespace media_stream