bluetooth: Move Bluetooth-related Blink API headers into their own directory.

public/platform/WebBluetoothError.h

 // Copyright 2014 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.
 
-#ifndef WebBluetoothError_h
-#define WebBluetoothError_h
-
-#include "WebString.h"
-
-namespace blink {
-
-// Error object when a bluetooth request can not be satisfied used to create
-// DOMExceptions.
-struct WebBluetoothError {
-    enum ErrorType {
-        NotFoundError,
-        SecurityError
-    };
-
-    WebBluetoothError(ErrorType errorType, const WebString& message)
-        : errorType(errorType)
-        , message(message)
-    {
-    }
-
-    ErrorType errorType;
-    WebString message;
-};
-
-} // namespace blink
-
-#endif // WebBluetoothError_h
+// TODO(ortuno): Will be removed in https://crrev.com/1060643002
+#include "public/platform/modules/bluetooth/WebBluetoothError.h"