Android: Use a ResourceThrottle to intercept GET downloads.

chrome/browser/android/chrome_web_contents_delegate_android.h

Index: chrome/browser/android/chrome_web_contents_delegate_android.h
diff --git a/chrome/browser/android/chrome_web_contents_delegate_android.h b/chrome/browser/android/chrome_web_contents_delegate_android.h
index 94ee39f98018348fb2f27b9059e85e7734c308b3..9e1db12c73f6de9d903567964c8d075c547a93c2 100644
--- a/chrome/browser/android/chrome_web_contents_delegate_android.h
+++ b/chrome/browser/android/chrome_web_contents_delegate_android.h
@@ -54,10 +54,6 @@ class ChromeWebContentsDelegateAndroid
                                    const gfx::RectF& active_rect) OVERRIDE;
   virtual content::JavaScriptDialogManager*
   GetJavaScriptDialogManager() OVERRIDE;
-  virtual void CanDownload(content::RenderViewHost* source,
-                           int request_id,
-                           const std::string& request_method,
-                           const base::Callback<void(bool)>& callback) OVERRIDE;
   virtual void DidNavigateToPendingEntry(content::WebContents* source) OVERRIDE;
   virtual void DidNavigateMainFramePostCommit(
       content::WebContents* source) OVERRIDE;