Use StringBuilder::appendLiteral() / StringBuilder::append(char) when possible

Source/core/frame/FrameConsole.cpp

 /*
  * Copyright (C) 2013 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 71 matching lines @@
 
     m_frame.chromeClient().addMessageToConsole(&m_frame, consoleMessage->source(), consoleMessage->level(), consoleMessage->message(), consoleMessage->lineNumber(), messageURL, stackTrace);
 }
 
 String FrameConsole::formatStackTraceString(const String& originalMessage, PassRefPtrWillBeRawPtr<ScriptCallStack> callStack)
 {
     StringBuilder stackTrace;
     for (size_t i = 0; i < callStack->size(); ++i) {
         const ScriptCallFrame& frame = callStack->at(i);
         stackTrace.append("\n    at " + (frame.functionName().length() ? frame.functionName() : "(anonymous function)"));
-        stackTrace.append(" (");
+        stackTrace.appendLiteral(" (");
         stackTrace.append(frame.sourceURL());
         stackTrace.append(':');
         stackTrace.append(String::number(frame.lineNumber()));
         stackTrace.append(':');
         stackTrace.append(String::number(frame.columnNumber()));
         stackTrace.append(')');
     }
 
     return stackTrace.toString();
 }
 
 void FrameConsole::mute()
 {
     muteCount++;
 }
 
 void FrameConsole::unmute()
 {
     ASSERT(muteCount > 0);
     muteCount--;
 }
 
 void FrameConsole::adoptWorkerConsoleMessages(WorkerGlobalScopeProxy* proxy)
 {
     InspectorInstrumentation::adoptWorkerConsoleMessages(m_frame.document(), proxy);
 }
 
 } // namespace blink