Revert "Disable minidump tests on Linux"

This reverts commit 6ae1f421.

Reason for revert: Incorrect test disabled.

Original change's description:
> Disable minidump tests on Linux
>
> Disables the Telemetry minidump symbolization tests on Linux, as they
> are currently flaking pretty badly.
>
> TBR=johnchen@chromium.org
>
> Bug: 1108432
> Change-Id: I3fab14b82de7440eff534169cf028d324d6f37c7
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2333667
> Reviewed-by: Brian Sheedy <bsheedy@chromium.org>
> Reviewed-by: John Chen <johnchen@chromium.org>
> Commit-Queue: Brian Sheedy <bsheedy@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#794208}

TBR=bsheedy@chromium.org,johnchen@chromium.org

Change-Id: I3cd4f00497602c008664e83413d6016e66e0b64d
Bug: 1108432
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2335482Reviewed-by: Brian Sheedy <bsheedy@chromium.org>
Reviewed-by: John Chen <johnchen@chromium.org>
Commit-Queue: Brian Sheedy <bsheedy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#795585}

tools/perf/core/minidump_unittest.py

@@ -35,7 +35,6 @@ class BrowserMinidumpTest(tab_test_case.TabTestCase):
   # still read-only, so skip the test in that case.
   @decorators.Disabled(
       'chromeos-local',
-      'linux',  # https://crbug.com/1108432
       'win7'  # https://crbug.com/1084931
   )
   def testSymbolizeMinidump(self):
@@ -81,7 +80,6 @@ class BrowserMinidumpTest(tab_test_case.TabTestCase):
   # still read-only, so skip the test in that case.
   @decorators.Disabled(
       'chromeos-local',
-      'linux',  # https://crbug.com/1108432
       'win7'  # https://crbug.com/1084931
   )
   def testMultipleCrashMinidumps(self):