Fix subframe loads with RenderViewTest when PlzNavigate is enabled.

content/test/test_render_frame.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_TEST_TEST_RENDER_FRAME_H_
 #define CONTENT_TEST_TEST_RENDER_FRAME_H_
 
 #include "base/macros.h"
 #include "content/renderer/render_frame_impl.h"
 
@@ skipping 27 matching lines @@
   void SetEditableSelectionOffsets(int start, int end);
   void ExtendSelectionAndDelete(int before, int after);
   void DeleteSurroundingText(int before, int after);
   void Unselect();
   void SetAccessibilityMode(AccessibilityMode new_mode);
   void SetCompositionFromExistingText(
       int start,
       int end,
       const std::vector<blink::WebCompositionUnderline>& underlines);
 
+  blink::WebNavigationPolicy decidePolicyForNavigation(
+    const blink::WebFrameClient::NavigationPolicyInfo& info) override;
+
  private:
   explicit TestRenderFrame(const RenderFrameImpl::CreateParams& params);
   DISALLOW_COPY_AND_ASSIGN(TestRenderFrame);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_TEST_TEST_RENDER_FRAME_H_