Revert of No longer requiring pixel output for WebRTC tests.

chrome/browser/media/webrtc_browsertest_base.cc

 // Copyright 2013 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/media/webrtc_browsertest_base.h"
 
 #include "base/lazy_instance.h"
 #include "base/strings/string_util.h"
 #include "base/strings/stringprintf.h"
 #include "chrome/browser/chrome_notification_types.h"
@@ skipping 64 matching lines @@
   return false;
 }
 
 }  // namespace
 
 WebRtcTestBase::WebRtcTestBase(): detect_errors_in_javascript_(false) {
   // The handler gets set for each test method, but that's fine since this
   // set operation is idempotent.
   logging::SetLogMessageHandler(&JavascriptErrorDetectingLogHandler);
   hit_javascript_errors_.Get() = false;
+
+  EnablePixelOutput();
 }
 
 WebRtcTestBase::~WebRtcTestBase() {
   if (detect_errors_in_javascript_) {
     EXPECT_FALSE(hit_javascript_errors_.Get())
         << "Encountered javascript errors during test execution (Search "
         << "for Uncaught or ERROR:CONSOLE in the test output).";
   }
 }
 
@@ skipping 264 matching lines @@
 #endif
 }
 
 bool WebRtcTestBase::OnWin8() const {
 #if defined(OS_WIN)
   return base::win::GetVersion() > base::win::VERSION_WIN7;
 #else
   return false;
 #endif
 }