Revert "Add file capturer to AppRTCMobile on simulator."

This reverts commit 5adcd198752b651f7b7e9199a91f9b873b7d7237.

Reason for revert: <INSERT REASONING HERE>

Original change's description:
> Add file capturer to AppRTCMobile on simulator.
> 
> To achieve this, the CL does the following
> - Adds sample mp4 video
> - Refactors the existing RTCFileVideoCapturer to achieve continious
> capture and adds tests.
> 
> Bug: webrtc:8406
> Change-Id: Ibc0891176c58ec9053b42e340d2113036e7199ec
> Reviewed-on: https://webrtc-review.googlesource.com/12180
> Reviewed-by: Anders Carlsson <andersc@webrtc.org>
> Reviewed-by: Magnus Jedvert <magjed@webrtc.org>
> Commit-Queue: Daniela Jovanoska Petrenko <denicija@webrtc.org>
> Cr-Commit-Position: refs/heads/master@{#20598}

TBR=magjed@webrtc.org,andersc@webrtc.org,denicija@webrtc.org

Change-Id: I73b35c67296c964f65d206454ac1329b4b979628
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: webrtc:8406
Reviewed-on: https://webrtc-review.googlesource.com/21240
Reviewed-by: Daniela Jovanoska Petrenko <denicija@webrtc.org>
Commit-Queue: Daniela Jovanoska Petrenko <denicija@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#20599}
diff --git a/examples/objc/AppRTCMobile/ARDSettingsModel.m b/examples/objc/AppRTCMobile/ARDSettingsModel.m
index a4eea73..0a2bee6 100644
--- a/examples/objc/AppRTCMobile/ARDSettingsModel.m
+++ b/examples/objc/AppRTCMobile/ARDSettingsModel.m
@@ -169,12 +169,20 @@
 
 - (void)registerStoreDefaults {
   NSString *defaultVideoResolutionSetting = [self defaultVideoResolutionSetting];
+  BOOL audioOnly = (defaultVideoResolutionSetting.length == 0);
+
+// The iOS simulator doesn't provide any sort of camera capture
+// support or emulation (http://goo.gl/rHAnC1) so don't bother
+// trying to open a local stream.
+#if TARGET_IPHONE_SIMULATOR
+  audioOnly = YES;
+#endif
 
   NSData *codecData = [NSKeyedArchiver archivedDataWithRootObject:[self defaultVideoCodecSetting]];
   [ARDSettingsStore setDefaultsForVideoResolution:[self defaultVideoResolutionSetting]
                                        videoCodec:codecData
                                           bitrate:nil
-                                        audioOnly:NO
+                                        audioOnly:audioOnly
                                     createAecDump:NO
                                useLevelController:NO
                              useManualAudioConfig:YES];