Cleanup PreferenceMACs on browser_tests startup

chrome/browser/prefs/tracked/pref_hash_browsertest.cc

Index: chrome/browser/prefs/tracked/pref_hash_browsertest.cc
diff --git a/chrome/browser/prefs/tracked/pref_hash_browsertest.cc b/chrome/browser/prefs/tracked/pref_hash_browsertest.cc
index 6cf4a89d3fa98a2ab9b34409ddd82bc80b69e8c7..3236587fdca97105ea3da821acc6ae178a579eda 100644
--- a/chrome/browser/prefs/tracked/pref_hash_browsertest.cc
+++ b/chrome/browser/prefs/tracked/pref_hash_browsertest.cc
@@ -519,9 +519,7 @@ class PrefHashBrowserTestUnchangedDefault : public PrefHashBrowserTestBase {
   }
 };
 
-// Test is flaky. crbug.com/723639

[jam, 2017/05/17 19:06:16]

https://codereview.chromium.org/2882423002 was also disabled

[gab, 2017/05/17 20:01:04]

Done.

-PREF_HASH_BROWSER_TEST(PrefHashBrowserTestUnchangedDefault,
-                       DISABLED_UnchangedDefault);
+PREF_HASH_BROWSER_TEST(PrefHashBrowserTestUnchangedDefault, UnchangedDefault);
 
 // Augments PrefHashBrowserTestUnchangedDefault to confirm that nothing is reset
 // when nothing is tampered with, even if Chrome itself wrote custom prefs in
@@ -548,9 +546,7 @@ class PrefHashBrowserTestUnchangedCustom
   }
 };
 
-// Test is flaky. crbug.com/723639
-PREF_HASH_BROWSER_TEST(PrefHashBrowserTestUnchangedCustom,
-                       DISABLED_UnchangedCustom);
+PREF_HASH_BROWSER_TEST(PrefHashBrowserTestUnchangedCustom, UnchangedCustom);
 
 // Verifies that cleared prefs are reported.
 class PrefHashBrowserTestClearedAtomic : public PrefHashBrowserTestBase {
@@ -622,9 +618,7 @@ class PrefHashBrowserTestClearedAtomic : public PrefHashBrowserTestBase {
   }
 };
 
-// Test is flaky. crbug.com/723639
-PREF_HASH_BROWSER_TEST(PrefHashBrowserTestClearedAtomic,
-                       DISABLED_ClearedAtomic);
+PREF_HASH_BROWSER_TEST(PrefHashBrowserTestClearedAtomic, ClearedAtomic);
 
 // Verifies that clearing the MACs results in untrusted Initialized pings for
 // non-null protected prefs.
@@ -758,9 +752,8 @@ class PrefHashBrowserTestUntrustedInitialized : public PrefHashBrowserTestBase {
   }
 };
 
-// Test is flaky. crbug.com/723639
 PREF_HASH_BROWSER_TEST(PrefHashBrowserTestUntrustedInitialized,
-                       DISABLED_UntrustedInitialized);
+                       UntrustedInitialized);
 
 // Verifies that changing an atomic pref results in it being reported (and reset
 // if the protection level allows it).
@@ -858,9 +851,7 @@ class PrefHashBrowserTestChangedAtomic : public PrefHashBrowserTestBase {
   }
 };
 
-// Test is flaky. crbug.com/723639
-PREF_HASH_BROWSER_TEST(PrefHashBrowserTestChangedAtomic,
-                       DISABLED_ChangedAtomic);
+PREF_HASH_BROWSER_TEST(PrefHashBrowserTestChangedAtomic, ChangedAtomic);
 
 // Verifies that changing or adding an entry in a split pref results in both
 // items being reported (and remove if the protection level allows it).
@@ -967,9 +958,7 @@ class PrefHashBrowserTestChangedSplitPref : public PrefHashBrowserTestBase {
   }
 };
 
-// Test is flaky. crbug.com/723639
-PREF_HASH_BROWSER_TEST(PrefHashBrowserTestChangedSplitPref,
-                       DISABLED_ChangedSplitPref);
+PREF_HASH_BROWSER_TEST(PrefHashBrowserTestChangedSplitPref, ChangedSplitPref);
 
 // Verifies that adding a value to unprotected preferences for a key which is
 // still using the default (i.e. has no value stored in protected preferences)
@@ -1053,9 +1042,8 @@ class PrefHashBrowserTestUntrustedAdditionToPrefs
   }
 };
 
-// Test is flaky. crbug.com/723639
 PREF_HASH_BROWSER_TEST(PrefHashBrowserTestUntrustedAdditionToPrefs,
-                       DISABLED_UntrustedAdditionToPrefs);
+                       UntrustedAdditionToPrefs);
 
 // Verifies that adding a value to unprotected preferences while wiping a
 // user-selected value from protected preferences doesn't allow that value to
@@ -1141,9 +1129,8 @@ class PrefHashBrowserTestUntrustedAdditionToPrefsAfterWipe
   }
 };
 
-// Test is flaky. crbug.com/723639
 PREF_HASH_BROWSER_TEST(PrefHashBrowserTestUntrustedAdditionToPrefsAfterWipe,
-                       DISABLED_UntrustedAdditionToPrefsAfterWipe);
+                       UntrustedAdditionToPrefsAfterWipe);
 
 #if defined(OS_WIN)
 class PrefHashBrowserTestRegistryValidationFailure
@@ -1186,9 +1173,8 @@ class PrefHashBrowserTestRegistryValidationFailure
   }
 };
 
-// Test is flaky. crbug.com/723639
 PREF_HASH_BROWSER_TEST(PrefHashBrowserTestRegistryValidationFailure,
-                       DISABLED_RegistryValidationFailure);
+                       RegistryValidationFailure);
 #endif
 
 // Verifies that all preferences related to choice of default search engine are
@@ -1293,6 +1279,4 @@ class PrefHashBrowserTestDefaultSearch : public PrefHashBrowserTestBase {
   }
 };
 
-// Test is flaky. crbug.com/723639
-PREF_HASH_BROWSER_TEST(PrefHashBrowserTestDefaultSearch,
-                       DISABLED_SearchProtected);
+PREF_HASH_BROWSER_TEST(PrefHashBrowserTestDefaultSearch, SearchProtected);