Web MIDI: regression bug fix

The send thread should start iff the thread is not running.
Accidentally, the condition was reversed :(

BUG=326888

Review URL: https://codereview.chromium.org/107513007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@239710 0039d316-1c4b-4281-b951-d872f2087c98

media/midi/midi_manager_mac.cc

@@ -109,7 +109,7 @@ void MIDIManagerMac::DispatchSendMIDIData(MIDIManagerClient* client,
                                           uint32 port_index,
                                           const std::vector<uint8>& data,
                                           double timestamp) {
-  if (send_thread_.IsRunning())
+  if (!send_thread_.IsRunning())
     send_thread_.Start();
 
   // OK to use base::Unretained(this) since we join to thread in dtor().