Sync the getComputedStyle() IDL with the spec

Source/core/frame/LocalDOMWindow.h

Index: Source/core/frame/LocalDOMWindow.h
diff --git a/Source/core/frame/LocalDOMWindow.h b/Source/core/frame/LocalDOMWindow.h
index 7c54295aed58f99fca4c6686f92039b03452e5c6..e0d3d5ac8251b0a3a313770b7b407450c1daa893 100644
--- a/Source/core/frame/LocalDOMWindow.h
+++ b/Source/core/frame/LocalDOMWindow.h
@@ -133,7 +133,7 @@ public:
     void close(ExecutionContext* = 0) override;
     void print() override;
     void stop() override;
-    void alert(const String& message = String()) override;
+    void alert(const String& message) override;

[arv (Not doing code reviews), 2014/12/01 14:20:09]

This looks unrelated

[philipj_slow, 2014/12/01 20:48:54]

Yeah, I forgot to say why in the description. The default argument String() for
alert() and getComputedStyle() aren't needed in the override because they aren't
omitted internally and also aren't part of the signature, so a different default
would still compile, I think. I've reverted the change and left alert() and
getComputedStyle() inconsistent on this point, let me know if you want me to
make it consistent and in which direction.

     bool confirm(const String& message) override;
     String prompt(const String& message, const String& defaultValue) override;
     bool find(const String&, bool caseSensitive, bool backwards, bool wrap, bool wholeWord, bool searchInFrames, bool showDialog) const override;