Remove DeviceManager and DeviceInfo.

talk/app/webrtc/objc/RTCVideoCapturer.mm

Index: talk/app/webrtc/objc/RTCVideoCapturer.mm
diff --git a/talk/app/webrtc/objc/RTCVideoCapturer.mm b/talk/app/webrtc/objc/RTCVideoCapturer.mm
index 2ce01f53a360e913f41a198c0a297768f2a9cb70..52119ce47840f3c4fbd2cc1a09f32c1f78f47058 100644
--- a/talk/app/webrtc/objc/RTCVideoCapturer.mm
+++ b/talk/app/webrtc/objc/RTCVideoCapturer.mm
@@ -32,30 +32,11 @@
 #import "RTCVideoCapturer+Internal.h"
 
 #include "webrtc/media/base/videocapturer.h"
-#include "webrtc/media/devices/devicemanager.h"
 
 @implementation RTCVideoCapturer {
   rtc::scoped_ptr<cricket::VideoCapturer> _capturer;
 }
 
-+ (RTCVideoCapturer*)capturerWithDeviceName:(NSString*)deviceName {

[tkchin_webrtc, 2016/03/02 21:13:37]

What is the new way of getting the cricket video capturer associated with a
device name?
Should not eliminate this code, but provide the new pathway first. (Otherwise
this class essentially becomes unusable; some third party folks might still be
using this)

[the sun, 2016/03/03 20:00:13]

I'm now using WebRtcVideoDeviceCapturerFactory to directly create the capturer
(from device name).

Problem is, there does not appear to be any tests running the code. How do we
make sure it works? Is it worth writing up a test for just this part of the
"legacy API"?

[tkchin_webrtc, 2016/03/04 01:18:35]

Nah, not worth adding a test for this. I've patched your CL and verified that it
works, thank you for adding it.

[the sun, 2016/03/04 07:48:15]

Thank you!

-  const std::string& device_name = std::string([deviceName UTF8String]);
-  rtc::scoped_ptr<cricket::DeviceManagerInterface> device_manager(
-      cricket::DeviceManagerFactory::Create());
-  bool initialized = device_manager->Init();
-  NSAssert(initialized, @"DeviceManager::Init() failed");
-  cricket::Device device;
-  if (!device_manager->GetVideoCaptureDevice(device_name, &device)) {
-    LOG(LS_ERROR) << "GetVideoCaptureDevice failed";
-    return 0;
-  }
-  rtc::scoped_ptr<cricket::VideoCapturer> capturer(
-      device_manager->CreateVideoCapturer(device));
-  RTCVideoCapturer* rtcCapturer =
-      [[RTCVideoCapturer alloc] initWithCapturer:capturer.release()];
-  return rtcCapturer;
-}
-
 @end
 
 @implementation RTCVideoCapturer (Internal)