Added supported formats caching to VideoCaptureManager.

media/video/capture/mac/video_capture_device_mac.mm

Index: media/video/capture/mac/video_capture_device_mac.mm
diff --git a/media/video/capture/mac/video_capture_device_mac.mm b/media/video/capture/mac/video_capture_device_mac.mm
index 04ded067f6455acce7733a69dc474be97eb8cefc..e74afa44e80641f83b3e05313f13c044eaae6a2b 100644
--- a/media/video/capture/mac/video_capture_device_mac.mm
+++ b/media/video/capture/mac/video_capture_device_mac.mm
@@ -82,8 +82,9 @@ void VideoCaptureDevice::GetDeviceNames(Names* device_names) {
 }
 
 // static
-void VideoCaptureDevice::GetDeviceSupportedFormats(const Name& device,
-    VideoCaptureCapabilities* formats) {
+void VideoCaptureDevice::GetDeviceSupportedFormats(
+    const Name& device,
+    VideoCaptureFormats* formats) {
   NOTIMPLEMENTED();
 }
 
@@ -203,10 +204,17 @@ 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);
-  Name* found = device_names.FindById(device_name_.id());
-  if (!found)
+  Names::iterator it = device_names.begin();
+  for (; it != device_names.end(); ++it) {
+    if (it->id() == device_name_.id())
+      break;
+  }
+  if (it == device_names.end())
     return false;
 
   if (AVFoundationGlue::IsAVFoundationSupported()) {