Fix copying from interstitial pages on OSX by going through the RenderWidgetHostDelegate.

content/browser/renderer_host/render_widget_host_delegate.h

Index: content/browser/renderer_host/render_widget_host_delegate.h
diff --git a/content/browser/renderer_host/render_widget_host_delegate.h b/content/browser/renderer_host/render_widget_host_delegate.h
index a2eb5e6e379535e4b3776e1243423ec918f716b5..e99fc451e1e6be4ffe050e03ea8b480a9794584a 100644
--- a/content/browser/renderer_host/render_widget_host_delegate.h
+++ b/content/browser/renderer_host/render_widget_host_delegate.h
@@ -75,6 +75,30 @@ class CONTENT_EXPORT RenderWidgetHostDelegate {
   virtual BrowserAccessibilityManager*
       GetOrCreateRootBrowserAccessibilityManager();
 
+  // Send the OS Undo action to the focused frame.
+  virtual void Undo();
+
+  // Send the OS Redo action to the focused frame.
+  virtual void Redo();
+
+  // Send the OS Cut action to the focused frame.
+  virtual void Cut();
+
+  // Send the OS Copy action to the focused frame.
+  virtual void Copy();
+
+  // Send the OS CopyToFindPboard action to the focused frame.
+  virtual void CopyToFindPboard();
+
+  // Send the OS Paste action to the focused frame.
+  virtual void Paste();
+
+  // Send the OS PasteAndMatchStyle action to the focused frame.
+  virtual void PasteAndMatchStyle();
+
+  // Send the OS SelectAll action to the focused frame.
+  virtual void SelectAll();
+
 #if defined(OS_WIN)
   virtual gfx::NativeViewAccessible GetParentNativeViewAccessible();
 #endif