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

Source/core/css/RuleSet.cpp

Index: Source/core/css/RuleSet.cpp
diff --git a/Source/core/css/RuleSet.cpp b/Source/core/css/RuleSet.cpp
index 71e89a8ecade09ea28fe031c2313b87e52c8323a..f2f2eb2ceb0a7cd4dc406e9eb267324796d692a6 100644
--- a/Source/core/css/RuleSet.cpp
+++ b/Source/core/css/RuleSet.cpp
@@ -225,7 +225,7 @@ static void collectFeaturesFromRuleData(RuleFeatureSet& features, const RuleData
     bool foundSiblingSelector = false;
     for (const CSSSelector* selector = ruleData.selector(); selector; selector = selector->tagHistory()) {
         features.collectFeaturesFromSelector(selector);
-        
+
         if (const CSSSelectorList* selectorList = selector->selectorList()) {
             for (const CSSSelector* subSelector = selectorList->first(); subSelector; subSelector = CSSSelectorList::next(subSelector)) {
                 if (!foundSiblingSelector && selector->isSiblingSelector())
@@ -240,7 +240,7 @@ static void collectFeaturesFromRuleData(RuleFeatureSet& features, const RuleData
     if (ruleData.containsUncommonAttributeSelector())
         features.uncommonAttributeRules.append(RuleFeature(ruleData.rule(), ruleData.selectorIndex(), ruleData.hasDocumentSecurityOrigin()));
 }
-    
+
 void RuleSet::addToRuleSet(StringImpl* key, PendingRuleMap& map, const RuleData& ruleData)
 {
     if (!key)