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

Source/wtf/text/StringHash.h

Index: Source/wtf/text/StringHash.h
diff --git a/Source/wtf/text/StringHash.h b/Source/wtf/text/StringHash.h
index e609e4b6a9bc2fa460a4a35b1fdfffcec616c01e..c517fd426d86e12d2eedb1edd44589f7d7041b15 100644
--- a/Source/wtf/text/StringHash.h
+++ b/Source/wtf/text/StringHash.h
@@ -91,13 +91,13 @@ namespace WTF {
         {
             return CaseFoldingHash::hash(reinterpret_cast<const LChar*>(data), length);
         }
-        
+
         static inline bool equal(const StringImpl* a, const StringImpl* b)
         {
             return equalIgnoringCaseNonNull(a, b);
         }
 
-        static unsigned hash(const RefPtr<StringImpl>& key) 
+        static unsigned hash(const RefPtr<StringImpl>& key)
         {
             return hash(key.get());
         }