Add prefix to empty param tests.

googletest will no longer support empty prefix
for parameterized INSTANTIATE_TEST_SUITE_P.
Adding "All" prefix to existing empty prefix test suites.

This CL was uploaded by git cl split.

R=phoglund@chromium.org

Bug: 1023677
Change-Id: I1ea903063c171fc143ad483696cfaaaef473d03f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1927007
Auto-Submit: Ilia Samsonov <isamsonov@google.com>
Reviewed-by: Patrik Höglund <phoglund@chromium.org>
Commit-Queue: Patrik Höglund <phoglund@chromium.org>
Cr-Commit-Position: refs/heads/master@{#717550}

content/browser/webrtc/webrtc_video_capture_shared_device_browsertest.cc

@@ -274,7 +274,7 @@ IN_PROC_BROWSER_TEST_P(
 }
 
 INSTANTIATE_TEST_SUITE_P(
-    ,
+    All,
     WebRtcVideoCaptureSharedDeviceBrowserTest,
     ::testing::Values(
         TestParams{ServiceApi::kSingleClient,