Enable UsingRealWebcam_* test on ChromeOS

Bug: 1069608
Test: Pass 'tast --verbose run <betty> "camera.CaptureUnittests"' 15
times in a row.

Change-Id: I30d6872ad9a6d30a41cc14648a12d71a1fed274a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2387911
Commit-Queue: Inker Kuo <inker@chromium.org>
Auto-Submit: Inker Kuo <inker@chromium.org>
Reviewed-by: Shik Chen <shik@chromium.org>
Reviewed-by: Guido Urdaneta <guidou@chromium.org>
Cr-Commit-Position: refs/heads/master@{#804650}

media/capture/video/video_capture_device_unittest.cc

@@ -97,13 +97,9 @@
 #define MAYBE_UsingRealWebcam_AllocateBadSize \
   DISABLED_UsingRealWebcam_AllocateBadSize
 #define MAYBE_UsingRealWebcam_CaptureMjpeg UsingRealWebcam_CaptureMjpeg
-// Flaky: https://crbug.com/1096082
-#define MAYBE_UsingRealWebcam_TakePhoto DISABLED_UsingRealWebcam_TakePhoto
-#define MAYBE_UsingRealWebcam_GetPhotoState \
-  DISABLED_UsingRealWebcam_GetPhotoState
-// Flaky crash: https://crbug.com/1069608
-#define MAYBE_UsingRealWebcam_CaptureWithSize \
-  DISABLED_UsingRealWebcam_CaptureWithSize
+#define MAYBE_UsingRealWebcam_TakePhoto UsingRealWebcam_TakePhoto
+#define MAYBE_UsingRealWebcam_GetPhotoState UsingRealWebcam_GetPhotoState
+#define MAYBE_UsingRealWebcam_CaptureWithSize UsingRealWebcam_CaptureWithSize
 #define MAYBE_UsingRealWebcam_CheckPhotoCallbackRelease \
   UsingRealWebcam_CheckPhotoCallbackRelease
 #elif defined(OS_LINUX)