Enable TimeFormattingTest.TimeFormat

The bug is fixed upstream

BUG=internal b/32972611
TEST=Run TimeFormattingTest*

Change-Id: Iadeab960f2eb67913a3d4f3bb302b8b95f200d4c
Reviewed-on: https://chromium-review.googlesource.com/777402Reviewed-by: Stephen Lanham <slan@chromium.org>
Commit-Queue: Bailey Forrest <bcf@chromium.org>
Cr-Commit-Position: refs/heads/master@{#517622}

chromecast/BUILD.gn

@@ -201,7 +201,6 @@ cast_test_group("cast_tests") {
         # Disable ProcessUtilTest.* (need to define OS_ANDROID)
         # Disable StackContainer.BufferAlignment (don't support 16-byte alignment)
         # Disable SystemMetrics2Test.GetSystemMemoryInfo (buffers>0 can't be guaranteed)
-        # Disable TimeFormattingTest.TimeFormat* for flakiness on devices (crbug/671429)
         # Disable PostTasksViaTaskRunner/* to green up devices (b/62246873)
         # Disable WorkerDetaches to green up devices (b/62246873)
         gtest_excludes += [
@@ -209,7 +208,6 @@ cast_test_group("cast_tests") {
           "ProcessUtilTest.*",
           "StackContainer.BufferAlignment",
           "SystemMetrics2Test.GetSystemMemoryInfo",
-          "TimeFormattingTest.TimeFormat*",
           "OneTraitsExecutionModePair/TaskSchedulerImplTest.PostTasksViaTaskRunner/*",
           "TaskSchedulerWorkerTest.WorkerDetaches",
         ]