Use the single char overload of append() when possible.

third_party/WebKit/Source/modules/webgl/WebGLRenderingContextBase.cpp

 /*
  * Copyright (C) 2009 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 516 matching lines @@
     formatWebGLStatusString("DEVICE", info.deviceId ? String::format("0x%04x", info.deviceId).utf8().data() : "0xffff", statusMessage);
     formatWebGLStatusString("GL_VENDOR", info.vendorInfo.utf8().data(), statusMessage);
     formatWebGLStatusString("GL_RENDERER", info.rendererInfo.utf8().data(), statusMessage);
     formatWebGLStatusString("GL_VERSION", info.driverVersion.utf8().data(), statusMessage);
     formatWebGLStatusString("Sandboxed", info.sandboxed ? "yes" : "no", statusMessage);
     formatWebGLStatusString("Optimus", info.optimus ? "yes" : "no", statusMessage);
     formatWebGLStatusString("AMD switchable", info.amdSwitchable ? "yes" : "no", statusMessage);
     formatWebGLStatusString("Reset notification strategy", String::format("0x%04x", info.resetNotificationStrategy).utf8().data(), statusMessage);
     formatWebGLStatusString("GPU process crash count", String::number(info.processCrashCount).utf8().data(), statusMessage);
     formatWebGLStatusString("ErrorMessage", info.errorMessage.utf8().data(), statusMessage);
-    statusMessage.append(".");
+    statusMessage.append('.');
     return statusMessage;
 }
 
 struct ContextProviderCreationInfo {
     // Inputs.
     Platform::ContextAttributes contextAttributes;
     Platform::GraphicsInfo* glInfo;
     ScriptState* scriptState;
     // Outputs.
     std::unique_ptr<WebGraphicsContext3DProvider> createdContextProvider;
@@ skipping 5935 matching lines @@
         contextGL()->PixelStorei(GL_UNPACK_ALIGNMENT, 1);
 }
 
 void WebGLRenderingContextBase::restoreUnpackParameters()
 {
     if (m_unpackAlignment != 1)
         contextGL()->PixelStorei(GL_UNPACK_ALIGNMENT, m_unpackAlignment);
 }
 
 } // namespace blink