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

Source/core/platform/Language.cpp

Index: Source/core/platform/Language.cpp
diff --git a/Source/core/platform/Language.cpp b/Source/core/platform/Language.cpp
index 2cd4ebbb510b5fe9009337cf6ba181da58c0fc73..110654595dcef1d9a275c004c7f26215b08aef86 100644
--- a/Source/core/platform/Language.cpp
+++ b/Source/core/platform/Language.cpp
@@ -81,20 +81,20 @@ void overrideUserPreferredLanguages(const Vector<String>& override)
 {
     preferredLanguagesOverride() = override;
 }
-    
+
 Vector<String> userPreferredLanguages()
 {
     Vector<String>& override = preferredLanguagesOverride();
     if (!override.isEmpty())
         return override;
-    
+
     return platformUserPreferredLanguages();
 }
 
 static String canonicalLanguageIdentifier(const String& languageCode)
 {
     String lowercaseLanguageCode = languageCode.lower();
-    
+
     if (lowercaseLanguageCode.length() >= 3 && lowercaseLanguageCode[2] == '_')
         lowercaseLanguageCode.replace(2, 1, "-");