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=mlamouri@chromium.org

Bug: 1023677
Change-Id: I2ccb853be1685d5e52e20a1cc855f4abf5347345
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1925738
Auto-Submit: Ilia Samsonov <isamsonov@google.com>
Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
Commit-Queue: Mounir Lamouri <mlamouri@chromium.org>
Cr-Commit-Position: refs/heads/master@{#717719}

content/browser/media/session/media_session_impl_browsertest.cc

@@ -309,7 +309,9 @@ class MediaSessionImplSyncBrowserTest : public MediaSessionImplBrowserTest {
   }
 };
 
-INSTANTIATE_TEST_SUITE_P(, MediaSessionImplParamBrowserTest, testing::Bool());
+INSTANTIATE_TEST_SUITE_P(All,
+                         MediaSessionImplParamBrowserTest,
+                         testing::Bool());
 
 IN_PROC_BROWSER_TEST_P(MediaSessionImplParamBrowserTest,
                        PlayersFromSameObserverDoNotStopEachOtherInSameSession) {