Provide an overload to WebView::create that does not require a WebViewClient.

media/blink/webmediaplayer_impl_unittest.cc

 // Copyright 2016 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 "media/blink/webmediaplayer_impl.h"
 
 #include <stdint.h>
 
 #include <memory>
 
@@ skipping 170 matching lines @@
   bool is_idle_ = false;
   bool is_stale_ = false;
   bool is_hidden_ = false;
   bool is_closed_ = false;
 };
 
 class WebMediaPlayerImplTest : public testing::Test {
  public:
   WebMediaPlayerImplTest()
       : media_thread_("MediaThreadForTest"),
-        web_view_(blink::WebView::create(nullptr,
-                                         blink::WebPageVisibilityStateVisible)),
+        web_view_(blink::WebView::create(blink::WebPageVisibilityStateVisible)),
         web_local_frame_(
             blink::WebLocalFrame::create(blink::WebTreeScopeType::Document,
                                          &web_frame_client_,
                                          nullptr,
                                          nullptr)),
         media_log_(new MediaLog()),
         audio_parameters_(TestAudioParameters::Normal()) {
     web_view_->setMainFrame(web_local_frame_);
     media_thread_.StartAndWaitForTesting();
   }
@@ skipping 715 matching lines @@
 
 INSTANTIATE_TEST_CASE_P(BackgroundBehaviorTestInstances,
                         WebMediaPlayerImplBackgroundBehaviorTest,
                         ::testing::Combine(::testing::Bool(),
                                            ::testing::Bool(),
                                            ::testing::Values(5, 300),
                                            ::testing::Values(5, 100),
                                            ::testing::Bool()));
 
 }  // namespace media