Fix TODO comments for the mac media capture part

media/video/capture/mac/video_capture_device_qtkit_mac.mm

Index: media/video/capture/mac/video_capture_device_qtkit_mac.mm
diff --git a/media/video/capture/mac/video_capture_device_qtkit_mac.mm b/media/video/capture/mac/video_capture_device_qtkit_mac.mm
index efbee0fd08a36ac19dc42a74155fb423bc30f5f1..f909bdaba42d65269db56acbc589be2d4c5ccb91 100644
--- a/media/video/capture/mac/video_capture_device_qtkit_mac.mm
+++ b/media/video/capture/mac/video_capture_device_qtkit_mac.mm
@@ -14,8 +14,18 @@
 
 #pragma mark Class methods
 
-+ (NSArray *)deviceNames {
-  return [QTCaptureDevice inputDevicesWithMediaType:QTMediaTypeVideo];
++ (NSDictionary *)deviceNames {
+  NSArray *captureDevices =
+      [QTCaptureDevice inputDevicesWithMediaType:QTMediaTypeVideo];
+  NSMutableDictionary *deviceNames =
+      [[[NSMutableDictionary alloc] init] autorelease];
+
+  for (QTCaptureDevice* device in captureDevices) {
+    NSString* qtDeviceName = [device localizedDisplayName];
+    NSString* qtUniqueId = [device uniqueID];
+    [deviceNames setObject:qtDeviceName forKey:qtUniqueId];
+  }
+  return deviceNames;
 }
 
 #pragma mark Public methods