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

Source/core/loader/EmptyClients.h

Index: Source/core/loader/EmptyClients.h
diff --git a/Source/core/loader/EmptyClients.h b/Source/core/loader/EmptyClients.h
index 37cd9686b08721f81ed18337ff9be0193133a269..b9388c09135b0a9845211f08b486b54535bc8c45 100644
--- a/Source/core/loader/EmptyClients.h
+++ b/Source/core/loader/EmptyClients.h
@@ -160,11 +160,11 @@ public:
     virtual void scheduleCompositingLayerFlush() OVERRIDE { }
 
     virtual void needTouchEvents(bool) OVERRIDE { }
-    
+
     virtual void numWheelEventHandlersChanged(unsigned) OVERRIDE { }
-    
+
     virtual bool shouldRubberBandInDirection(WebCore::ScrollDirection) const OVERRIDE { return false; }
-    
+
     virtual bool isEmptyChromeClient() const OVERRIDE { return true; }
 
     virtual void didAssociateFormControls(const Vector<RefPtr<Element> >&) OVERRIDE { }