Use a union typdef for the return type of canvas.getContext

third_party/WebKit/Source/core/html/HTMLCanvasElement.idl

Index: third_party/WebKit/Source/core/html/HTMLCanvasElement.idl
diff --git a/third_party/WebKit/Source/core/html/HTMLCanvasElement.idl b/third_party/WebKit/Source/core/html/HTMLCanvasElement.idl
index 15e7e501013358ba0c18fdce61628b3026ea8c88..0f07c5a0479d6658190ed88c221cbbfdb1be12a9 100644
--- a/third_party/WebKit/Source/core/html/HTMLCanvasElement.idl
+++ b/third_party/WebKit/Source/core/html/HTMLCanvasElement.idl
@@ -28,26 +28,13 @@
 
 interface HTMLCanvasElement : HTMLElement
 {
+    // Note: Due to dependecies on modules, getContext is defined in a partial
+    // interface in HTMLCanvasElementModule.idl
+
     // FIXME: width and height should be unsigned long.
     attribute long width;
     attribute long height;
 
-    // Note: this differs deliberately from the specified Web IDL for this function:
-    //     RenderingContext? getContext(DOMString contextId, any... arguments);
-    // in order to eliminate the custom binding. It is functionally equivalent.
-    //
-    // The PermissiveDictionaryConversion extended attribute is needed to allow the
-    // autogenerated code to match the behavior of the custom binding. Web IDL
-    // requires throwing TypeError if the incoming argument is not an object type
-    // (and is not undefined or null). The binding must ignore this.
-    //
-    // Also note: the only reason this must return type "any" is to allow the
-    // InspectorInstrumentation wrappers to be called for canvases. If that could be
-    // handled differently the return type could be changed to "RenderingContext?"
-    // and the [CallWith=ScriptState] extended attribute removed.
-    //
-    [CallWith=ScriptState] any getContext(DOMString contextId, [PermissiveDictionaryConversion] optional CanvasContextCreationAttributes attributes);
-
     // Note: The arguments argument is variadic in the spec, but not here as
     // only one extra argument is actually used.
     // FIXME: type should not have a default value.