clang/win: Fix most -Wunused-function warnings in Chromium code.

content/renderer/renderer_main_platform_delegate_win.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/renderer/renderer_main_platform_delegate.h"
 
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/strings/string16.h"
@@ skipping 23 matching lines @@
 
 // Windows-only skia sandbox support
 // These are used for GDI-path rendering.
 void SkiaPreCacheFont(const LOGFONT& logfont) {
   RenderThread* render_thread = RenderThread::Get();
   if (render_thread) {
     render_thread->PreCacheFont(logfont);
   }
 }
 
-void SkiaPreCacheFontCharacters(const LOGFONT& logfont,
-                                const wchar_t* text,
-                                unsigned int text_length) {
-  RenderThreadImpl* render_thread_impl = RenderThreadImpl::current();
-  if (render_thread_impl) {
-    render_thread_impl->PreCacheFontCharacters(
-        logfont,
-        base::string16(text, text_length));
-  }
-}
-
 void WarmupDirectWrite() {
   // The objects used here are intentionally not freed as we want the Skia
   // code to use these objects after warmup.
   SetDefaultSkiaFactory(GetPreSandboxWarmupFontMgr());
 
   // We need to warm up *some* font for DirectWrite. We also need to pass one
   // down for the CC HUD code, so use the same one here. Note that we don't use
   // a monospace as would be nice in an attempt to avoid a small startup time
   // regression, see http://crbug.com/463613.
   skia::RefPtr<SkTypeface> hud_typeface = skia::AdoptRef(
@@ skipping 62 matching lines @@
       return false;
 #endif
 
     target_services->LowerToken();
     return true;
   }
   return false;
 }
 
 }  // namespace content