Bug 42616: Remove VideoCaptureTest.kt.

This is a workaround to fix the GeckoView build with WebRTC disabled.
We should replace this workaround with a proper solution, that
excludes this test when MOZ_WEBRTC is undefined/False.

mobile/android/geckoview/src/androidTest/java/org/mozilla/geckoview/test/VideoCaptureTest.kt

-package org.mozilla.geckoview.test
-
-import androidx.test.ext.junit.runners.AndroidJUnit4
-import androidx.test.filters.SmallTest
-import androidx.test.platform.app.InstrumentationRegistry
-import org.junit.Assert.assertEquals
-import org.junit.Test
-import org.junit.runner.RunWith
-import org.webrtc.CameraEnumerationAndroid.CaptureFormat
-import org.webrtc.CameraEnumerator
-import org.webrtc.CameraVideoCapturer
-import org.webrtc.CameraVideoCapturer.CameraEventsHandler
-import org.webrtc.videoengine.VideoCaptureAndroid
-
-@RunWith(AndroidJUnit4::class)
-@SmallTest
-class VideoCaptureTest {
-    // Always throw exception.
-    class BadCameraEnumerator : CameraEnumerator {
-        override fun getDeviceNames(): Array<String?>? {
-            throw java.lang.RuntimeException("")
-        }
-
-        override fun isFrontFacing(deviceName: String?): Boolean {
-            throw java.lang.RuntimeException("")
-        }
-
-        override fun isBackFacing(deviceName: String?): Boolean {
-            throw java.lang.RuntimeException("")
-        }
-
-        override fun isInfrared(deviceName: String?): Boolean {
-            throw java.lang.RuntimeException("")
-        }
-
-        override fun getSupportedFormats(deviceName: String?): List<CaptureFormat?>? {
-            throw java.lang.RuntimeException("")
-        }
-
-        override fun createCapturer(
-            deviceName: String?,
-            eventsHandler: CameraEventsHandler?,
-        ): CameraVideoCapturer? {
-            throw java.lang.RuntimeException("")
-        }
-    }
-
-    @Test
-    fun constructWithBadEnumerator() {
-        val ctr = VideoCaptureAndroid::class.java.getDeclaredConstructors()[0].apply { isAccessible = true }
-        val capture = ctr.newInstance(
-            InstrumentationRegistry.getInstrumentation().targetContext,
-            "my camera",
-            BadCameraEnumerator(),
-        ) as VideoCaptureAndroid
-        assertEquals(false, capture.canCapture())
-    }
-}