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}

sdk/objc/Framework/UnitTests/RTCFileVideoCapturer_xctest.mm

@@ -1,111 +0,0 @@
-/*
- *  Copyright 2017 The WebRTC project authors. All Rights Reserved.
- *
- *  Use of this source code is governed by a BSD-style license
- *  that can be found in the LICENSE file in the root of the source
- *  tree. An additional intellectual property rights grant can be found
- *  in the file PATENTS.  All contributing project authors may
- *  be found in the AUTHORS file in the root of the source tree.
- */
-
-#import "WebRTC/RTCFileVideoCapturer.h"
-
-#import <XCTest/XCTest.h>
-
-#include "rtc_base/gunit.h"
-
-NSString *const kTestFileName = @"foreman.mp4";
-static const int kTestTimeoutMs = 5 * 1000;  // 5secs.
-
-@interface MockCapturerDelegate : NSObject <RTCVideoCapturerDelegate>
-
-@property(nonatomic, assign) NSInteger capturedFramesCount;
-
-@end
-
-@implementation MockCapturerDelegate
-@synthesize capturedFramesCount = _capturedFramesCount;
-
-- (void)capturer:(RTCVideoCapturer *)capturer didCaptureVideoFrame:(RTCVideoFrame *)frame {
-  self.capturedFramesCount++;
-}
-
-@end
-
-NS_CLASS_AVAILABLE_IOS(10)
-@interface RTCFileVideoCapturerTests : XCTestCase
-
-@property(nonatomic, strong) RTCFileVideoCapturer *capturer;
-@property(nonatomic, strong) MockCapturerDelegate *mockDelegate;
-
-@end
-
-@implementation RTCFileVideoCapturerTests
-@synthesize capturer = _capturer;
-@synthesize mockDelegate = _mockDelegate;
-
-- (void)setUp {
-  self.mockDelegate = [[MockCapturerDelegate alloc] init];
-  self.capturer = [[RTCFileVideoCapturer alloc] initWithDelegate:self.mockDelegate];
-}
-
-- (void)tearDown {
-  self.capturer = nil;
-  self.mockDelegate = nil;
-}
-
-- (void)testCaptureWhenFileNotInBundle {
-  __block BOOL errorOccured = NO;
-
-  RTCFileVideoCapturerErrorBlock errorBlock = ^void(NSError *error) {
-    errorOccured = YES;
-  };
-
-  [self.capturer startCapturingFromFileNamed:@"not_in_bundle.mov" onError:errorBlock];
-  ASSERT_TRUE_WAIT(errorOccured, kTestTimeoutMs);
-}
-
-- (void)testSecondStartCaptureCallFails {
-  __block BOOL secondError = NO;
-
-  RTCFileVideoCapturerErrorBlock firstErrorBlock = ^void(NSError *error) {
-    // This block should never be called.
-    NSLog(@"Error: %@", [error userInfo]);
-    ASSERT_TRUE(false);
-  };
-
-  RTCFileVideoCapturerErrorBlock secondErrorBlock = ^void(NSError *error) {
-    secondError = YES;
-  };
-
-  [self.capturer startCapturingFromFileNamed:kTestFileName onError:firstErrorBlock];
-  [self.capturer startCapturingFromFileNamed:kTestFileName onError:secondErrorBlock];
-
-  ASSERT_TRUE_WAIT(secondError, kTestTimeoutMs);
-}
-
-- (void)testStartStopCapturer {
-  if (@available(iOS 10, *)) {
-    [self.capturer startCapturingFromFileNamed:kTestFileName onError:nil];
-
-    __block BOOL done = NO;
-    __block NSInteger capturedFrames = -1;
-    NSInteger capturedFramesAfterStop = -1;
-
-    // We're dispatching the `stopCapture` with delay to ensure the capturer has
-    // had the chance to capture several frames.
-    dispatch_time_t captureDelay = dispatch_time(DISPATCH_TIME_NOW, 2 * NSEC_PER_SEC);  // 2secs.
-    dispatch_after(captureDelay, dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
-      capturedFrames = self.mockDelegate.capturedFramesCount;
-      [self.capturer stopCapture];
-      done = YES;
-    });
-    WAIT(done, kTestTimeoutMs);
-
-    capturedFramesAfterStop = self.mockDelegate.capturedFramesCount;
-    ASSERT_TRUE(capturedFrames != -1);
-    ASSERT_EQ(capturedFrames, capturedFramesAfterStop);
-  }
-}
-
-@end