remove use of WriteAscii for vtune

R=svenpanne@chromium.org
BUG=

Review URL: https://codereview.chromium.org/14900003

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@14562 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/third_party/vtune/vtune-jit.cc

@@ -194,8 +194,8 @@ void VTUNEJITInterface::event_handler(const v8::JitCodeEvent* event) {
          if ((*script->GetScriptName())->IsString()) {
             Handle<String> script_name =
                 Handle<String>(String::Cast(*script->GetScriptName()));
-            temp_file_name = new char[script_name->Length() + 1];
-            script_name->WriteAscii(temp_file_name);
+            temp_file_name = new char[script_name->Utf8Length() + 1];
+            script_name->WriteUtf8(temp_file_name);
             jmethod.source_file_name = temp_file_name;
           }