Revert of Break page load metrics test dependency on IPC.

chrome/browser/page_load_metrics/metrics_web_contents_observer_unittest.cc

 // 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.
 
 #include "chrome/browser/page_load_metrics/metrics_web_contents_observer.h"
 
 #include <memory>
 #include <vector>
 
 #include "base/macros.h"
@@ skipping 149 matching lines @@
     content::WebContentsTester::For(web_contents())
         ->NavigateAndCommit(GURL(url::kAboutBlankURL));
   }
 
   void SimulateTimingUpdate(const PageLoadTiming& timing) {
     SimulateTimingUpdate(timing, web_contents()->GetMainFrame());
   }
 
   void SimulateTimingUpdate(const PageLoadTiming& timing,
                             content::RenderFrameHost* render_frame_host) {
-    observer_->OnTimingUpdated(render_frame_host, timing, PageLoadMetadata());
+    ASSERT_TRUE(observer_->OnMessageReceived(
+        PageLoadMetricsMsg_TimingUpdated(observer_->routing_id(), timing,
+                                         PageLoadMetadata()),
+        render_frame_host));
   }
 
   void AttachObserver() {
     embedder_interface_ = new TestPageLoadMetricsEmbedderInterface();
     // Owned by the web_contents. Tests must be careful not to call
     // SimulateTimingUpdate after they call DeleteContents() without also
     // calling AttachObserver() again. Otherwise they will use-after-free the
     // observer_.
     observer_ = MetricsWebContentsObserver::CreateForWebContents(
         web_contents(), base::WrapUnique(embedder_interface_));
@@ skipping 482 matching lines @@
   web_contents_tester->NavigateAndCommit(GURL(kDefaultTestUrl2));
   ASSERT_EQ(std::vector<GURL>({GURL(kDefaultTestUrl)}),
             completed_filtered_urls());
 
   web_contents_tester->NavigateAndCommit(GURL(kDefaultTestUrl));
   ASSERT_EQ(std::vector<GURL>({GURL(kDefaultTestUrl), GURL(kDefaultTestUrl2)}),
             completed_filtered_urls());
 }
 
 }  // namespace page_load_metrics