Revert "Sync change log from trunk."

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21282 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

ChangeLog

-2014-05-13: Sentinel
+2014-05-09: Sentinel
 
         The ChangeLog file is no longer maintained on bleeding_edge. This
         sentinel should stay on top of this list.
 
-2014-05-13: Version 3.27.2
-
-        Harden %SetIsObserved with RUNTIME_ASSERTs (Chromium issue 371782).
-
-        Drop unused static microtask API.
-
-        Introduce an api to query the microtask autorun state of an isolate.
-
-        Performance and stability improvements on all platforms.
-
-
-2014-05-12: Version 3.27.1
-
-        Object.observe: avoid accessing acceptList properties more than once
-        (issue 3315).
-
-        Array Iterator prototype should not have a constructor (issue 3293).
-
-        Fix typos in unit test for Array.prototype.fill().
-
-        Shorten autogenerated error message for functions only (issue 3019,
-        Chromium issue 331971).
-
-        Reland "Removed default Isolate." (Chromium issue 359977).
-
-        Performance and stability improvements on all platforms.
-
 
 2014-05-09: Version 3.27.0