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

Source/bindings/v8/custom/V8TrackEventCustom.cpp

Index: Source/bindings/v8/custom/V8TrackEventCustom.cpp
diff --git a/Source/bindings/v8/custom/V8TrackEventCustom.cpp b/Source/bindings/v8/custom/V8TrackEventCustom.cpp
index 8cd482fe906bfd9d828b1ca9e96734bf2075ebe9..b853ddd44e6e44c132bbb2e94b197f58093cad5b 100644
--- a/Source/bindings/v8/custom/V8TrackEventCustom.cpp
+++ b/Source/bindings/v8/custom/V8TrackEventCustom.cpp
@@ -42,7 +42,7 @@ void V8TrackEvent::trackAttrGetterCustom(v8::Local<v8::String> name, const v8::P
 {
     TrackEvent* trackEvent = V8TrackEvent::toNative(info.Holder());
     TrackBase* track = trackEvent->track();
-    
+
     if (!track) {
         v8SetReturnValueNull(info);
         return;
@@ -53,7 +53,7 @@ void V8TrackEvent::trackAttrGetterCustom(v8::Local<v8::String> name, const v8::P
         // This should never happen.
         ASSERT_NOT_REACHED();
         break;
-        
+
     case TrackBase::TextTrack:
         v8SetReturnValue(info, toV8Fast(static_cast<TextTrack*>(track), info, trackEvent));
         return;