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=kbabbitt@microsoft.com

Bug: 1023677
Change-Id: I432d207b93c1146c24c36d08062b1ffa033caad5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1926803
Auto-Submit: Ilia Samsonov <isamsonov@google.com>
Reviewed-by: Kevin Babbitt <kbabbitt@microsoft.com>
Commit-Queue: Kevin Babbitt <kbabbitt@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#717711}

content/browser/accessibility/dump_accessibility_events_browsertest.cc

@@ -227,7 +227,7 @@ struct DumpAccessibilityEventsTestPassToString {
 };
 
 INSTANTIATE_TEST_SUITE_P(
-    ,
+    All,
     DumpAccessibilityEventsTest,
     ::testing::Range(size_t{0},
                      AccessibilityEventRecorder::GetTestPasses().size()),