Revert 124453 - WebWidgetClient::screenInfo() no longer does a synchronous IPC.

content/browser/renderer_host/render_message_filter.h

Index: content/browser/renderer_host/render_message_filter.h
diff --git a/content/browser/renderer_host/render_message_filter.h b/content/browser/renderer_host/render_message_filter.h
index ab54ac33f98fe7ee416491fac99d56273e4430b6..d2386e7d4691f92e5e5cb6825d5f64510b165b11 100644
--- a/content/browser/renderer_host/render_message_filter.h
+++ b/content/browser/renderer_host/render_message_filter.h
@@ -144,6 +144,8 @@ class RenderMessageFilter : public content::BrowserMessageFilter {
 #if defined(OS_WIN) && !defined(USE_AURA)
   // On Windows, we handle these on the IO thread to avoid a deadlock with
   // plugins.  On non-Windows systems, we need to handle them on the UI thread.
+  void OnGetScreenInfo(gfx::NativeViewId window,
+                       WebKit::WebScreenInfo* results);
   void OnGetWindowRect(gfx::NativeViewId window, gfx::Rect* rect);
   void OnGetRootWindowRect(gfx::NativeViewId window, gfx::Rect* rect);
 #endif