Fixing a number of Dart2JS compiler warnings.

sdk/lib/web_gl/dart2js/web_gl_dart2js.dart

Index: sdk/lib/web_gl/dart2js/web_gl_dart2js.dart
diff --git a/sdk/lib/web_gl/dart2js/web_gl_dart2js.dart b/sdk/lib/web_gl/dart2js/web_gl_dart2js.dart
index fa316549f115d032e5cf5d0442b562956d538eca..91c3949b862e87f6e8fc55f8a55b28a91b29acf4 100644
--- a/sdk/lib/web_gl/dart2js/web_gl_dart2js.dart
+++ b/sdk/lib/web_gl/dart2js/web_gl_dart2js.dart
@@ -2465,7 +2465,7 @@ class RenderingContext extends CanvasRenderingContext native "WebGLRenderingCont
       return;
     }
     if ((border_OR_canvas_OR_image_OR_pixels_OR_video is ImageData || border_OR_canvas_OR_image_OR_pixels_OR_video == null) && format == null && type == null && pixels == null) {
-      var pixels_1 = _convertDartToNative_ImageData(border_OR_canvas_OR_image_OR_pixels_OR_video);
+      var pixels_1 = convertDartToNative_ImageData(border_OR_canvas_OR_image_OR_pixels_OR_video);
       _texImage2D_2(target, level, internalformat, format_OR_width, height_OR_type, pixels_1);
       return;
     }
@@ -2520,7 +2520,7 @@ class RenderingContext extends CanvasRenderingContext native "WebGLRenderingCont
       return;
     }
     if ((canvas_OR_format_OR_image_OR_pixels_OR_video is ImageData || canvas_OR_format_OR_image_OR_pixels_OR_video == null) && type == null && pixels == null) {
-      var pixels_1 = _convertDartToNative_ImageData(canvas_OR_format_OR_image_OR_pixels_OR_video);
+      var pixels_1 = convertDartToNative_ImageData(canvas_OR_format_OR_image_OR_pixels_OR_video);
       _texSubImage2D_2(target, level, xoffset, yoffset, format_OR_width, height_OR_type, pixels_1);
       return;
     }