Fix leak of RTCPeerConnectionHandler if PeerConnection.close() is called from js.

content/renderer/media/rtc_peer_connection_handler_unittest.cc

Index: content/renderer/media/rtc_peer_connection_handler_unittest.cc
diff --git a/content/renderer/media/rtc_peer_connection_handler_unittest.cc b/content/renderer/media/rtc_peer_connection_handler_unittest.cc
index 6cbdd1db986c06622a30e80969fa77bfff3495d4..88fad70aa2dde5224965d7ad792de5680fa03927 100644
--- a/content/renderer/media/rtc_peer_connection_handler_unittest.cc
+++ b/content/renderer/media/rtc_peer_connection_handler_unittest.cc
@@ -334,6 +334,11 @@ TEST_F(RTCPeerConnectionHandlerTest, Destruct) {
   pc_handler_.reset(NULL);
 }
 
+TEST_F(RTCPeerConnectionHandlerTest, DestructAllHandlers) {
+  EXPECT_CALL(*mock_client_.get(), releasePeerConnectionHandler())
+      .Times(1);
+  RTCPeerConnectionHandler::DestructAllHandlers();
+}
 TEST_F(RTCPeerConnectionHandlerTest, CreateOffer) {
   blink::WebRTCSessionDescriptionRequest request;
   blink::WebMediaConstraints options;