mac: Prepare for -Wunused-functions.

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 7d5bf548ab0b0b0500ed2fddb7b993317cd63210..0899c2129dfbe47429221eede64bc86d95d420ba 100644
--- a/content/renderer/npapi/webplugin_delegate_proxy.cc
+++ b/content/renderer/npapi/webplugin_delegate_proxy.cc
@@ -666,14 +666,6 @@ bool WebPluginDelegateProxy::CreateSharedBitmap(
   return !!canvas->get();
 }
 
-#if defined(OS_MACOSX)
-// Flips |rect| vertically within an enclosing rect with height |height|.
-// Intended for converting rects between flipped and non-flipped contexts.
-static void FlipRectVerticallyWithHeight(gfx::Rect* rect, int height) {
-  rect->set_y(height - rect->bottom());
-}
-#endif
-
 void WebPluginDelegateProxy::Paint(SkCanvas* canvas,
                                    const gfx::Rect& damaged_rect) {
   // Limit the damaged rectangle to whatever is contained inside the plugin