Android: Remove video recording functionality from the camera classes

There was an attempt to add MediaRecording functionality to the camera
classes, but it was never finished and never worked properly. This CL
removes the code for it. In the future, if offline video recording is
needed we should add it as a VideoSink instead of inside the camera
classes.

Bug: webrtc:9144
Change-Id: I74b70d4b128aa212d84e70da01e5e19133c5af24
Reviewed-on: https://webrtc-review.googlesource.com/69642
Reviewed-by: Sami Kalliomäki <sakal@webrtc.org>
Commit-Queue: Magnus Jedvert <magjed@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#23050}

sdk/android/instrumentationtests/src/org/webrtc/Camera2CapturerTest.java

@@ -246,12 +246,6 @@ public class Camera2CapturerTest {
     fixtures.cameraEventsInvoked();
   }
 
-  @Test
-  @MediumTest
-  public void testUpdateMediaRecorder() throws InterruptedException, IOException {
-    fixtures.updateMediaRecorder(true /* useSurfaceCapture */);
-  }
-
   // Test what happens when attempting to call e.g. switchCamera() after camera has been stopped.
   @Test
   @MediumTest