Web MIDI: move MIDI message validating logic into message_util.{cc|h}

content/browser/media/midi_host.h

Index: content/browser/media/midi_host.h
diff --git a/content/browser/media/midi_host.h b/content/browser/media/midi_host.h
index b5220d48821a0f05eb666e918b30c527b4c643ca..993a06c72b0e08152d5170fa353da10f241660ac 100644
--- a/content/browser/media/midi_host.h
+++ b/content/browser/media/midi_host.h
@@ -70,17 +70,9 @@ class CONTENT_EXPORT MidiHost : public BrowserMessageFilter,
   ~MidiHost() override;
 
  private:
-  FRIEND_TEST_ALL_PREFIXES(MidiHostTest, IsValidWebMIDIData);
   friend class base::DeleteHelper<MidiHost>;
   friend class BrowserThread;
 
-  // Returns true if |data| fulfills the requirements of MidiOutput.send API
-  // defined in the Web MIDI spec.
-  // - |data| must be any number of complete MIDI messages (data abbreviation
-  //    called "running status" is disallowed).
-  // - 1-byte MIDI realtime messages can be placed at any position of |data|.
-  static bool IsValidWebMIDIData(const std::vector<uint8_t>& data);
-
   int renderer_process_id_;
 
   // Represents if the renderer has a permission to send/receive MIDI SysEX