Move download stuff to download tab helper.

content/browser/tab_contents/tab_contents_delegate.h

Index: content/browser/tab_contents/tab_contents_delegate.h
diff --git a/content/browser/tab_contents/tab_contents_delegate.h b/content/browser/tab_contents/tab_contents_delegate.h
index 4638bdb88d29c998060fec2d17328d4732bb0f1e..39002e3159a79b01a01c0d9d608b0ba42c4e9e85 100644
--- a/content/browser/tab_contents/tab_contents_delegate.h
+++ b/content/browser/tab_contents/tab_contents_delegate.h
@@ -27,7 +27,6 @@ class HistoryAddPageArgs;
 }
 
 struct ContextMenuParams;
-class DownloadItem;
 class GURL;
 class HtmlDialogUIDelegate;
 struct NativeWebKeyboardEvent;
@@ -209,10 +208,6 @@ class TabContentsDelegate {
   // This is used to make painting look smoother.
   virtual int GetExtraRenderViewHeight() const;
 
-  virtual bool CanDownload(int request_id);
-
-  virtual void OnStartDownload(DownloadItem* download, TabContents* tab);
-
   // Returns true if the context menu operation was handled by the delegate.
   virtual bool HandleContextMenu(const ContextMenuParams& params);