Enable the magnification desktop capturer on Windows by default.

content/browser/media/capture/desktop_capture_device.cc

 // Copyright (c) 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 "content/browser/media/capture/desktop_capture_device.h"
 
 #include "base/bind.h"
 #include "base/location.h"
 #include "base/logging.h"
-#include "base/metrics/field_trial.h"
 #include "base/metrics/histogram.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/synchronization/lock.h"
 #include "base/threading/thread.h"
 #include "base/timer/timer.h"
 #include "content/browser/media/capture/desktop_capture_device_uma_types.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/desktop_media_id.h"
 #include "media/base/video_util.h"
 #include "third_party/libyuv/include/libyuv/scale_argb.h"
@@ skipping 361 matching lines @@
   webrtc::DesktopCaptureOptions options =
       webrtc::DesktopCaptureOptions::CreateDefault();
   // Leave desktop effects enabled during WebRTC captures.
   options.set_disable_effects(false);
 
   scoped_ptr<webrtc::DesktopCapturer> capturer;
 
   switch (source.type) {
     case DesktopMediaID::TYPE_SCREEN: {
 #if defined(OS_WIN)
-      if (base::FieldTrialList::FindFullName("ScreenCaptureUseMagnification") ==
-          "Enabled") {
-        options.set_allow_use_magnification_api(true);
-      }
+      options.set_allow_use_magnification_api(true);
 #endif
-
       scoped_ptr<webrtc::ScreenCapturer> screen_capturer(
           webrtc::ScreenCapturer::Create(options));
       if (screen_capturer && screen_capturer->SelectScreen(source.id)) {
         capturer.reset(new webrtc::DesktopAndCursorComposer(
             screen_capturer.release(),
             webrtc::MouseCursorMonitor::CreateForScreen(options, source.id)));
         IncrementDesktopCaptureCounter(SCREEN_CAPTURER_CREATED);
       }
       break;
     }
@@ skipping 61 matching lines @@
 #else
   base::MessageLoop::Type thread_type = base::MessageLoop::TYPE_DEFAULT;
 #endif
 
   thread_.StartWithOptions(base::Thread::Options(thread_type, 0));
 
   core_.reset(new Core(thread_.message_loop_proxy(), capturer.Pass(), type));
 }
 
 }  // namespace content