Re-enable CrOS minidump tests

Re-enables the BrowserMinidumpTests on ChromeOS since the CL that was
supposedly causing extra crash dumps to appear unexpectedly on Betty
devices has been reverted.

TBR=crouleau@chromium.org

Bug: 1014754
Change-Id: I93645b8fb8994ad9e7506d7e2a07e4ce520c03f2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1933596Reviewed-by: Brian Sheedy <bsheedy@chromium.org>
Reviewed-by: Caleb Rouleau <crouleau@chromium.org>
Commit-Queue: Brian Sheedy <bsheedy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#718783}

tools/perf/core/minidump_unittest.py

@@ -20,8 +20,7 @@ class BrowserMinidumpTest(tab_test_case.TabTestCase):
   # Android is currently hard coded to return None for minidump paths.
   # Minidump symbolization doesn't work in ChromeOS local mode if the rootfs is
   # still read-only, so skip the test in that case.
-  # Flakes on chromeos: crbug.com/1014754
-  @decorators.Disabled('android', 'chromeos', 'chromeos-local')
+  @decorators.Disabled('android', 'chromeos-local')
   def testSymbolizeMinidump(self):
     # Wait for the browser to restart fully before crashing
     self._LoadPageThenWait('var sam = "car";', 'sam')
@@ -102,8 +101,7 @@ class BrowserMinidumpTest(tab_test_case.TabTestCase):
   @decorators.Isolated
   # Minidump symbolization doesn't work in ChromeOS local mode if the rootfs is
   # still read-only, so skip the test in that case.
-  # Flakes on chromeos: crbug.com/1014754
-  @decorators.Disabled('android', 'chromeos', 'chromeos-local')
+  @decorators.Disabled('android', 'chromeos-local')
   def testMultipleCrashMinidumps(self):
     # Wait for the browser to restart fully before crashing
     self._LoadPageThenWait('var cat = "dog";', 'cat')