Fix trailing whitespace in .cpp, .h, and .idl files

Source/core/page/scrolling/ScrollingCoordinator.h

Index: Source/core/page/scrolling/ScrollingCoordinator.h
diff --git a/Source/core/page/scrolling/ScrollingCoordinator.h b/Source/core/page/scrolling/ScrollingCoordinator.h
index e8e17626b14fdc5257cda6084a26febee1f1881d..acb13c67a58f2fbf4e8e78f4c10e9a3c906c54f4 100644
--- a/Source/core/page/scrolling/ScrollingCoordinator.h
+++ b/Source/core/page/scrolling/ScrollingCoordinator.h
@@ -63,7 +63,7 @@ public:
     // Should be called whenever the given frame view has been laid out.
     void frameViewLayoutUpdated(FrameView*);
 
-    // Should be called whenever a wheel event handler is added or removed in the 
+    // Should be called whenever a wheel event handler is added or removed in the
     // frame view's underlying document.
     void frameViewWheelEventHandlerCountChanged(FrameView*);
 
@@ -130,7 +130,7 @@ private:
 
     bool hasVisibleSlowRepaintViewportConstrainedObjects(FrameView*) const;
     void updateShouldUpdateScrollLayerPositionOnMainThread();
-    
+
     static WebKit::WebLayer* scrollingWebLayerForScrollableArea(ScrollableArea*);
 
     bool touchHitTestingEnabled() const;