Revert 235728 "Removed RunUntilIdle between Stop and Close in UT..."

trunk/src/media/video/capture/mac/video_capture_device_mac.mm

 // Copyright (c) 2012 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 "media/video/capture/mac/video_capture_device_mac.h"
 
 #include "base/bind.h"
 #include "base/location.h"
 #include "base/logging.h"
 #include "base/time/time.h"
@@ skipping 190 matching lines @@
   [capture_device_ setFrameReceiver:nil];
   client_.reset();
   state_ = kIdle;
   tried_to_square_pixels_ = false;
 }
 
 bool VideoCaptureDeviceMac::Init() {
   DCHECK_EQ(loop_proxy_, base::MessageLoopProxy::current());
   DCHECK_EQ(state_, kNotInitialized);
 
-  // TODO(mcasas): The following check might not be necessary; if the device has
-  // disappeared after enumeration and before coming here, opening would just
-  // fail but not necessarily produce a crash.
   Names device_names;
   GetDeviceNames(&device_names);
-  Names::iterator it = device_names.begin();
-  for (; it != device_names.end(); ++it) {
-    if (it->id() == device_name_.id())
-      break;
-  }
-  if (it == device_names.end())
+  Name* found = device_names.FindById(device_name_.id());
+  if (!found)
     return false;
 
   capture_device_ =
       [[VideoCaptureDeviceQTKit alloc] initWithFrameReceiver:this];
   if (!capture_device_)
     return false;
 
   state_ = kIdle;
   return true;
 }
@@ skipping 98 matching lines @@
  if (![capture_device_ setCaptureHeight:current_settings_.height
                                   width:current_settings_.width
                               frameRate:current_settings_.frame_rate]) {
    ReceiveError("Could not configure capture device.");
    return false;
  }
  return true;
 }
 
 } // namespace media