Revert "Re-enable WebRTC webcam tests."

This reverts commit ca965d9a.

Reason for revert: Failing on Win7
https://ci.chromium.org/buildbot/chromium.webrtc/Win7%20Tester/46658

Original change's description:
> Re-enable WebRTC webcam tests.
> 
> Webcams should be fixed on all chromium.webrtc bots now.
> 
> Bug: 896654
> Change-Id: I6e3694e88c24ad754ec5f852d1cc6165a5482ccd
> Reviewed-on: https://chromium-review.googlesource.com/c/1295811
> Reviewed-by: Mirko Bonadei <mbonadei@chromium.org>
> Reviewed-by: Stephen Martinis <martiniss@chromium.org>
> Commit-Queue: Patrik Höglund <phoglund@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#603459}

TBR=phoglund@chromium.org,martiniss@chromium.org,mbonadei@chromium.org

Change-Id: I5b5d743fb41075ebfae9e27d733b83767a3ebca4
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 896654
Reviewed-on: https://chromium-review.googlesource.com/c/1304513Reviewed-by: Olga Sharonova <olka@chromium.org>
Commit-Queue: Olga Sharonova <olka@chromium.org>
Cr-Commit-Position: refs/heads/master@{#603474}

testing/buildbot/chromium.webrtc.json

@@ -65,7 +65,8 @@
           "--enable-logging",
           "--v=1",
           "--test-launcher-jobs=1",
-          "--test-launcher-print-test-stdio=always"
+          "--test-launcher-print-test-stdio=always",
+          "--gtest_filter=-*UsingRealWebcam*"
         ],
         "swarming": {
           "can_use_on_swarming_builders": false
@@ -169,7 +170,8 @@
           "--enable-logging",
           "--v=1",
           "--test-launcher-jobs=1",
-          "--test-launcher-print-test-stdio=always"
+          "--test-launcher-print-test-stdio=always",
+          "--gtest_filter=-*UsingRealWebcam*"
         ],
         "swarming": {
           "can_use_on_swarming_builders": false
@@ -274,7 +276,8 @@
           "--enable-logging",
           "--v=1",
           "--test-launcher-jobs=1",
-          "--test-launcher-print-test-stdio=always"
+          "--test-launcher-print-test-stdio=always",
+          "--gtest_filter=-*UsingRealWebcam*"
         ],
         "swarming": {
           "can_use_on_swarming_builders": false
@@ -371,7 +374,8 @@
           "--enable-logging",
           "--v=1",
           "--test-launcher-jobs=1",
-          "--test-launcher-print-test-stdio=always"
+          "--test-launcher-print-test-stdio=always",
+          "--gtest_filter=-*UsingRealWebcam*"
         ],
         "swarming": {
           "can_use_on_swarming_builders": false
@@ -469,7 +473,8 @@
           "--enable-logging",
           "--v=1",
           "--test-launcher-jobs=1",
-          "--test-launcher-print-test-stdio=always"
+          "--test-launcher-print-test-stdio=always",
+          "--gtest_filter=-*UsingRealWebcam*"
         ],
         "swarming": {
           "can_use_on_swarming_builders": false

testing/buildbot/test_suites.pyl

@@ -2335,7 +2335,10 @@
       # Run capture unittests as well since our bots have real webcams.
       'capture_unittests': {
         'args': ['--enable-logging', '--v=1', '--test-launcher-jobs=1',
-                 '--test-launcher-print-test-stdio=always'],
+                 '--test-launcher-print-test-stdio=always',
+                 # TODO(crbug.com/893494): Remove once real webcams are fixed
+                 # on chromium.webrtc Mac and Win bots.
+                 '--gtest_filter=-*UsingRealWebcam*'],
         'swarming': {
           'can_use_on_swarming_builders': False,
         },