Introduce Promise mapping to the IDL generator

Source/modules/imagebitmap/ImageBitmapFactories.idl

Index: Source/modules/imagebitmap/ImageBitmapFactories.idl
diff --git a/Source/modules/imagebitmap/ImageBitmapFactories.idl b/Source/modules/imagebitmap/ImageBitmapFactories.idl
index 0f91f22a5ecb82eb7683cf60ad442e7948f968da..90cacf0acc3441098473bd301a03d45d588593c5 100644
--- a/Source/modules/imagebitmap/ImageBitmapFactories.idl
+++ b/Source/modules/imagebitmap/ImageBitmapFactories.idl
@@ -28,17 +28,14 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-// FIXME: |PromiseValue| should be replaced with |Promise|. http://crbug.com/266700
-typedef any PromiseValue;
-
 [
     NoInterfaceObject,
     EnabledAtRuntime=ExperimentalCanvasFeatures
 ] interface ImageBitmapFactories {
-    [RaisesException] PromiseValue createImageBitmap(Blob blob);
-    [RaisesException] PromiseValue createImageBitmap(Blob blob, long sx, long sy, long sw, long sh);
-    [RaisesException] PromiseValue createImageBitmap(ImageData data);
-    [RaisesException] PromiseValue createImageBitmap(ImageData data, long sx, long sy, long sw, long sh);
-    [RaisesException] PromiseValue createImageBitmap(ImageBitmap bitmap);
-    [RaisesException] PromiseValue createImageBitmap(ImageBitmap bitmap, long sx, long sy, long sw, long sh);
+    [RaisesException] Promise createImageBitmap(Blob blob);
+    [RaisesException] Promise createImageBitmap(Blob blob, long sx, long sy, long sw, long sh);
+    [RaisesException] Promise createImageBitmap(ImageData data);
+    [RaisesException] Promise createImageBitmap(ImageData data, long sx, long sy, long sw, long sh);
+    [RaisesException] Promise createImageBitmap(ImageBitmap bitmap);
+    [RaisesException] Promise createImageBitmap(ImageBitmap bitmap, long sx, long sy, long sw, long sh);
 };