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=hbos@chromium.org

Bug: 1023677
Change-Id: I5fbe780a4db60b341fe697b9b33a0a453459927f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1925461
Auto-Submit: Ilia Samsonov <isamsonov@google.com>
Reviewed-by: Henrik Boström <hbos@chromium.org>
Commit-Queue: Henrik Boström <hbos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#717586}

chrome/browser/media/webrtc/webrtc_getdisplaymedia_browsertest.cc

@@ -188,7 +188,7 @@ IN_PROC_BROWSER_TEST_P(WebRtcGetDisplayMediaBrowserTestWithFakeUI,
   EXPECT_EQ(result, base::StringPrintf("%d", kMaxFrameRate));
 }
 
-INSTANTIATE_TEST_SUITE_P(,
+INSTANTIATE_TEST_SUITE_P(All,
                          WebRtcGetDisplayMediaBrowserTestWithFakeUI,
                          testing::Values(TestConfig{"monitor", "true", "never"},
                                          TestConfig{"window", "true", "never"},