[Mojo Video Capture] Use string keys instead of VideoCaptureDeviceDescriptor

services/video_capture/fake_device_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 "base/memory/ref_counted.h"
 #include "base/run_loop.h"
 #include "media/base/video_frame.h"
 #include "media/mojo/common/media_type_converters.h"
 #include "services/video_capture/fake_device_test.h"
 #include "services/video_capture/mock_video_frame_receiver.h"
@@ skipping 13 matching lines @@
   media::VideoFrame::StorageType storage_type;
   bool is_mappable;
   base::TimeDelta timestamp;
 };
 
 } // anonymous namespace
 
 namespace video_capture {
 
 TEST_F(FakeDeviceTest, FrameCallbacksArrive) {
-  VideoCaptureSettings arbitrary_requested_settings;
-  arbitrary_requested_settings.format.frame_size.SetSize(640, 480);
-  arbitrary_requested_settings.format.frame_rate = 15;
-  arbitrary_requested_settings.resolution_change_policy =
-      media::RESOLUTION_POLICY_FIXED_RESOLUTION;
-  arbitrary_requested_settings.power_line_frequency =
-      media::PowerLineFrequency::FREQUENCY_DEFAULT;
-
   base::RunLoop wait_loop;
   const int kNumFramesToWaitFor = 3;
   int num_frames_arrived = 0;
   mojom::VideoFrameReceiverPtr receiver_proxy;
   MockVideoFrameReceiver receiver(mojo::GetProxy(&receiver_proxy));
   EXPECT_CALL(receiver, OnIncomingCapturedVideoFramePtr(_))
       .WillRepeatedly(InvokeWithoutArgs(
           [&wait_loop, &kNumFramesToWaitFor, &num_frames_arrived]() {
             num_frames_arrived += 1;
             if (num_frames_arrived >= kNumFramesToWaitFor) {
               wait_loop.Quit();
             }
           }));
 
-  fake_device_proxy_->Start(arbitrary_requested_settings,
+  fake_device_proxy_->Start(requestable_settings_,
                             std::move(receiver_proxy));
   wait_loop.Run();
 }
 
 // Tests that frames received from a fake capture device match the requested
 // format and have increasing timestamps.
 TEST_F(FakeDeviceTest, ReceiveFramesFromFakeCaptureDevice) {
   base::RunLoop wait_loop;
   mojom::VideoFrameReceiverPtr receiver_proxy;
   constexpr int num_frames_to_receive = 2;
@@ skipping 36 matching lines @@
     EXPECT_EQ(requestable_settings_.format.frame_size,
               frame_info.size);
     // Timestamps are expected to increase
     if (i > 0)
       EXPECT_GT(frame_info.timestamp, previous_timestamp);
     previous_timestamp = frame_info.timestamp;
   }
 }
 
 }  // namespace video_capture