base: Remove the string logging from CHECK().

chrome/test/media_router/media_router_integration_browsertest.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/test/media_router/media_router_integration_browsertest.h"
 
 #include <memory>
 
 #include "base/bind.h"
 #include "base/files/file_util.h"
@@ skipping 231 matching lines @@
 }
 
 void MediaRouterIntegrationBrowserTest::SetTestData(
     base::FilePath::StringPieceType test_data_file) {
   base::FilePath full_path = GetResourceFile(test_data_file);
   JSONFileValueDeserializer deserializer(full_path);
   int error_code = 0;
   std::string error_message;
   std::unique_ptr<base::Value> value =
       deserializer.Deserialize(&error_code, &error_message);
-  CHECK(value.get()) << "Deserialize failed: " << error_message;
+  // Deserialize failed.
+  CHECK(value.get());
   std::string test_data_str;
   ASSERT_TRUE(base::JSONWriter::Write(*value, &test_data_str));
   ExecuteScriptInBackgroundPageNoWait(
       extension_id_,
       base::StringPrintf("localStorage['testdata'] = '%s'",
                          test_data_str.c_str()));
 }
 
 content::WebContents* MediaRouterIntegrationBrowserTest::OpenMRDialog(
     content::WebContents* web_contents) {
@@ skipping 366 matching lines @@
 
   MediaRouterDialogControllerImpl* controller =
       MediaRouterDialogControllerImpl::GetOrCreateForWebContents(web_contents);
   EXPECT_TRUE(controller->IsShowingMediaRouterDialog());
   WaitUntilSinkDiscoveredOnUI();
   controller->HideMediaRouterDialog();
   CheckStartFailed(web_contents, "NotFoundError", "No screens found.");
 }
 
 }  // namespace media_router