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

content/renderer/npapi/webplugin_delegate_proxy.cc

Index: content/renderer/npapi/webplugin_delegate_proxy.cc
diff --git a/content/renderer/npapi/webplugin_delegate_proxy.cc b/content/renderer/npapi/webplugin_delegate_proxy.cc
index 0ba60f240f116f9cdf4813f360643543a0640b78..8c32c4b6d158174db4afd6020217310f03bbfd96 100644
--- a/content/renderer/npapi/webplugin_delegate_proxy.cc
+++ b/content/renderer/npapi/webplugin_delegate_proxy.cc
@@ -609,13 +609,13 @@ void WebPluginDelegateProxy::ResetWindowlessBitmaps() {
   front_buffer_diff_ = gfx::Rect();
 }
 
+#if !defined(OS_WIN)
 static size_t BitmapSizeForPluginRect(const gfx::Rect& plugin_rect) {
   const size_t stride =
       skia::PlatformCanvasStrideForWidth(plugin_rect.width());
   return stride * plugin_rect.height();
 }
 
-#if !defined(OS_WIN)
 bool WebPluginDelegateProxy::CreateLocalBitmap(
     std::vector<uint8>* memory,
     scoped_ptr<skia::PlatformCanvas>* canvas) {