Move NewDownload out of AwContentsIoThreadClientImpl to AwContentsClientBridge

android_webview/browser/aw_contents_client_bridge_base.h

Index: android_webview/browser/aw_contents_client_bridge_base.h
diff --git a/android_webview/browser/aw_contents_client_bridge_base.h b/android_webview/browser/aw_contents_client_bridge_base.h
index d8d4d8121090ef231d50a750c4f8fcbd2944b4c7..65436b6e66647aeb1cad44fee8bb3579b8a19e38 100644
--- a/android_webview/browser/aw_contents_client_bridge_base.h
+++ b/android_webview/browser/aw_contents_client_bridge_base.h
@@ -70,6 +70,12 @@ class AwContentsClientBridgeBase {
                                         bool has_user_gesture,
                                         bool is_redirect,
                                         bool is_main_frame) = 0;
+
+  virtual void NewDownload(const GURL& url,
+                           const std::string& user_agent,
+                           const std::string& content_disposition,
+                           const std::string& mime_type,
+                           int64_t content_length) = 0;
 };
 
 }  // namespace android_webview