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

Source/core/html/HTMLLabelElement.cpp

Index: Source/core/html/HTMLLabelElement.cpp
diff --git a/Source/core/html/HTMLLabelElement.cpp b/Source/core/html/HTMLLabelElement.cpp
index 44ac76d8b188ec30038f5a77ebd3f9113a1ee645..9f3d061a1e7c74a9e6fffe74b5c5216590f2e2fa 100644
--- a/Source/core/html/HTMLLabelElement.cpp
+++ b/Source/core/html/HTMLLabelElement.cpp
@@ -108,7 +108,7 @@ void HTMLLabelElement::setHovered(bool over)
 {
     if (over == hovered())
         return;
-        
+
     // Update our status first.
     HTMLElement::setHovered(over);
 
@@ -139,10 +139,10 @@ void HTMLLabelElement::defaultEventHandler(Event* evt)
             element->focus();
 
         processingClick = false;
-        
+
         evt->setDefaultHandled();
     }
-    
+
     HTMLElement::defaultEventHandler(evt);
 }