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

Source/core/html/HTMLPlugInImageElement.h

Index: Source/core/html/HTMLPlugInImageElement.h
diff --git a/Source/core/html/HTMLPlugInImageElement.h b/Source/core/html/HTMLPlugInImageElement.h
index fc797716c394e4ec7e39affae27fbb3a2aed16be..771d0806e7e1d2c9b11847c2f8e77fbb1059985d 100644
--- a/Source/core/html/HTMLPlugInImageElement.h
+++ b/Source/core/html/HTMLPlugInImageElement.h
@@ -76,7 +76,7 @@ public:
 
     // Plug-in URL might not be the same as url() with overriding parameters.
     void subframeLoaderWillCreatePlugIn(const KURL& plugInURL);
-    
+
 protected:
     HTMLPlugInImageElement(const QualifiedName& tagName, Document*, bool createdByParser, PreferPlugInsForImagesOption);
 
@@ -86,7 +86,7 @@ protected:
     String m_serviceType;
     String m_url;
     KURL m_loadedUrl;
-    
+
     static void updateWidgetCallback(Node*);
     virtual void attach(const AttachContext& = AttachContext()) OVERRIDE;
     virtual void detach(const AttachContext& = AttachContext()) OVERRIDE;