Fix the indentation of MouseEvent.pageX/Y

Source/core/events/MouseEvent.idl

Index: Source/core/events/MouseEvent.idl
diff --git a/Source/core/events/MouseEvent.idl b/Source/core/events/MouseEvent.idl
index 6aa051a1a54c41b26ea8f6c70fb6708e2188b59a..9a6a514320379c9565c631fae1f2ec31d8ccf9cc 100644
--- a/Source/core/events/MouseEvent.idl
+++ b/Source/core/events/MouseEvent.idl
@@ -58,8 +58,8 @@
     // http://dev.w3.org/csswg/cssom-view/#extensions-to-the-mouseevent-interface
     // TODO(philipj): These attributes should be of type double, and the spec
     // also redefines screenX/Y and clientX/Y as double.
-    readonly attribute long             pageX;
-    readonly attribute long             pageY;
+    readonly attribute long pageX;
+    readonly attribute long pageY;
     [MeasureAs=MouseEventX] readonly attribute long x;
     [MeasureAs=MouseEventY] readonly attribute long y;
     [MeasureAs=MouseEventOffsetX] readonly attribute long offsetX;