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

Source/core/css/RuleSet.h

Index: Source/core/css/RuleSet.h
diff --git a/Source/core/css/RuleSet.h b/Source/core/css/RuleSet.h
index 69f2b27bbd0c31455a860eda6efa1e8ba49cb596..eb10e8d17f291f1933fafd63cb8c7e13bcca2149 100644
--- a/Source/core/css/RuleSet.h
+++ b/Source/core/css/RuleSet.h
@@ -36,7 +36,7 @@ enum AddRuleFlags {
     RuleCanUseFastCheckSelector   = 1 << 1,
     RuleIsInRegionRule            = 1 << 2,
 };
-    
+
 enum PropertyWhitelistType {
     PropertyWhitelistNone   = 0,
     PropertyWhitelistRegion,
@@ -88,7 +88,7 @@ private:
     unsigned m_hasDocumentSecurityOrigin : 1;
     unsigned m_propertyWhitelistType : 2;
 };
-    
+
 struct SameSizeAsRuleData {
     void* a;
     unsigned b;