Remove DeviceManager and DeviceInfo.

BUG=webrtc:5615, webrtc:5620

Review URL: https://codereview.webrtc.org/1715883002

Cr-Commit-Position: refs/heads/master@{#12020}
diff --git a/webrtc/api/api.gyp b/webrtc/api/api.gyp
index d97c38b..93db18b 100644
--- a/webrtc/api/api.gyp
+++ b/webrtc/api/api.gyp
@@ -236,6 +236,13 @@
                 'objc/RTCNSGLVideoView.h',
                 'objc/RTCNSGLVideoView.m',
               ],
+              'link_settings': {
+                'xcode_settings': {
+                  'OTHER_LDFLAGS': [
+                    '-framework OpenGL',
+                  ],
+                },
+              },
             }],
           ],
         }