Use correct WebView from TestRunner methods called via testRunner bindings.

content/shell/renderer/layout_test/layout_test_content_renderer_client.cc

 // Copyright (c) 2014 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.
 
 #include "content/shell/renderer/layout_test/layout_test_content_renderer_client.h"
 
 #include "base/callback.h"
 #include "base/command_line.h"
 #include "base/debug/debugger.h"
 #include "components/test_runner/mock_credential_manager_client.h"
@@ skipping 85 matching lines @@
   new LayoutTestRenderFrameObserver(render_frame);
 }
 
 void LayoutTestContentRendererClient::RenderViewCreated(
     RenderView* render_view) {
   new ShellRenderViewObserver(render_view);
 
   test_runner::WebTestProxyBase* proxy = GetWebTestProxyBase(render_view);
   proxy->set_web_widget(render_view->GetWebView());
   proxy->set_web_view(render_view->GetWebView());
+  proxy->Reset();
   proxy->SetSendWheelGestures(UseGestureBasedWheelScrolling());
 
   BlinkTestRunner* test_runner = BlinkTestRunner::Get(render_view);
   test_runner->Reset(false /* for_new_test */);
 
   LayoutTestRenderThreadObserver::GetInstance()
       ->test_interfaces()
       ->TestRunner()
       ->InitializeWebViewWithMocks(render_view->GetWebView());
 
@@ skipping 74 matching lines @@
 LayoutTestContentRendererClient::CreateMediaStreamRendererFactory() {
 #if defined(ENABLE_WEBRTC)
   return std::unique_ptr<MediaStreamRendererFactory>(
       new TestMediaStreamRendererFactory());
 #else
   return nullptr;
 #endif
 }
 
 }  // namespace content