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

Source/bindings/v8/custom/V8AudioContextCustom.cpp

Index: Source/bindings/v8/custom/V8AudioContextCustom.cpp
diff --git a/Source/bindings/v8/custom/V8AudioContextCustom.cpp b/Source/bindings/v8/custom/V8AudioContextCustom.cpp
index b9c84ff905af9672235dc15b5e15b26a7b86c2e2..99c8174cb4d47b75a09d2d7f5d581f70522acd09 100644
--- a/Source/bindings/v8/custom/V8AudioContextCustom.cpp
+++ b/Source/bindings/v8/custom/V8AudioContextCustom.cpp
@@ -46,7 +46,7 @@ void V8AudioContext::constructorCustom(const v8::FunctionCallbackInfo<v8::Value>
     Document* document = currentDocument();
 
     RefPtr<AudioContext> audioContext;
-    
+
     if (!args.Length()) {
         // Constructor for default AudioContext which talks to audio hardware.
         audioContext = AudioContext::create(document);
@@ -68,7 +68,7 @@ void V8AudioContext::constructorCustom(const v8::FunctionCallbackInfo<v8::Value>
         throwError(v8SyntaxError, "Error creating AudioContext", args.GetIsolate());
         return;
     }
-    
+
     // Transform the holder into a wrapper object for the audio context.
     v8::Handle<v8::Object> wrapper = args.Holder();
     V8DOMWrapper::associateObjectWithWrapper<V8AudioContext>(audioContext.release(), &info, wrapper, args.GetIsolate(), WrapperConfiguration::Dependent);