Fix the flakiness of StopGeneratedStreamsOnChannelClosing on Android bot

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 e5b31ee83f2c4271d3929382fc27758311face5d..eb56bd9802f317e91d37b0df0fc657be1bdae144 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
@@ -372,13 +372,13 @@ TEST_F(MediaStreamDispatcherHostTest, StopGeneratedStreamsOnChannelClosing) {
   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(_, _, _))