Remove useless calls to v8::Value::ToString()

Source/bindings/v8/ScriptDebugServer.cpp

Index: Source/bindings/v8/ScriptDebugServer.cpp
diff --git a/Source/bindings/v8/ScriptDebugServer.cpp b/Source/bindings/v8/ScriptDebugServer.cpp
index fec238aa636ea89396b4e7cc7faf5c4e9f97693f..4e665eca629ca45c3549cb87cf86c6d4916ace55 100644
--- a/Source/bindings/v8/ScriptDebugServer.cpp
+++ b/Source/bindings/v8/ScriptDebugServer.cpp
@@ -102,7 +102,7 @@ String ScriptDebugServer::setBreakpoint(const String& sourceID, const ScriptBrea
         return "";
     *actualLineNumber = args->Get(v8::String::NewSymbol("lineNumber"))->Int32Value();
     *actualColumnNumber = args->Get(v8::String::NewSymbol("columnNumber"))->Int32Value();
-    return toWebCoreString(breakpointId->ToString());
+    return toWebCoreString(breakpointId.As<v8::String>());
 }
 
 void ScriptDebugServer::removeBreakpoint(const String& breakpointId)