Fix trailing whitespace in .cpp, .h, and .idl files (ex. Source/core)

Source/wtf/RefCountedLeakCounter.h

Index: Source/wtf/RefCountedLeakCounter.h
diff --git a/Source/wtf/RefCountedLeakCounter.h b/Source/wtf/RefCountedLeakCounter.h
index 31778c4dd767cbebca6f0c3ee852be661cc52693..ba273bcf4269ecd38a8b73162ddb791389feb916 100644
--- a/Source/wtf/RefCountedLeakCounter.h
+++ b/Source/wtf/RefCountedLeakCounter.h
@@ -17,20 +17,20 @@
  *  Boston, MA 02110-1301, USA.
  *
  */
- 
+
 #ifndef RefCountedLeakCounter_h
 #define RefCountedLeakCounter_h
- 
+
 #include "wtf/Assertions.h"
 #include "wtf/Threading.h"
 #include "wtf/WTFExport.h"
 
 namespace WTF {
-    
+
     struct WTF_EXPORT RefCountedLeakCounter {
         static void suppressMessages(const char*);
         static void cancelMessageSuppression(const char*);
-        
+
         explicit RefCountedLeakCounter(const char* description);
         ~RefCountedLeakCounter();