Re-enable two pyauto instant-related tests that are now passing.

chrome/test/functional/PYAUTO_TESTS

Index: chrome/test/functional/PYAUTO_TESTS
diff --git a/chrome/test/functional/PYAUTO_TESTS b/chrome/test/functional/PYAUTO_TESTS
index b0bed25a205b930c3cb0d17c45f80f4ef75b4b77..163051681b3bf92ca103fad7c19be12a17c24596 100644
--- a/chrome/test/functional/PYAUTO_TESTS
+++ b/chrome/test/functional/PYAUTO_TESTS
@@ -87,10 +87,6 @@
       '-browsing_data.BrowsingDataTest.testClearingAccuracy',
       # Turkish I problem. crbug.com/60638
       '-find_in_page.FindMatchTests.testLocalizationAndCaseOrder',
-      # crbug.com/87959
-      '-instant.InstantTest.testInstantLoadsFor100CharsLongQuery',
-      # crbug.com/83459
-      '-instant.InstantTest.testPreFetchInstantURLSetsNoCookies',
       '-omnibox.OmniboxTest.testHistoryResult',  # crbug.com/71715
       # crbug.com/91033
       '-omnibox.OmniboxTest.testOmniboxSearchHistory',
@@ -486,9 +482,6 @@
       # ==================================================
       # Disabled tests that need to be investigated/fixed.
       # ==================================================
-      # crbug.com/83459
-      '-instant.InstantTest.testPreFetchInstantURLSetsNoCookies',
-
       # crbug.com/95035
       '-enterprise.EnterpriseTestReverse.testEnable3DAPI',
     ],