Revert 230512 "Replace the CreateEvent/OpenEvent patches with th..."

Broke sbox_integration_tests on xp, vista, win7

http://build.chromium.org/p/chromium.win/builders/Win7%20Tests%20%28dbg%29%283%29/builds/22841
http://build.chromium.org/p/chromium.win/builders/Vista%20Tests%20%281%29/builds/41417
http://build.chromium.org/p/chromium.win/builders/XP%20Tests%20%281%29/builds/28655

Failing tests:
SyncPolicyTest.TestEvent
SyncPolicyTest.TestEventReadOnly

> Replace the CreateEvent/OpenEvent patches with their Nt counterparts like NtOpenEvent and NtCreateEvent.
> 
> Reason being :- We patch these APIS via the Export table patch which does not work with bound imports. This results in our
> patched functions never getting called.
> 
> This should fix the GPU process hang with the XP presentation path.
> 
> BUG=305815
> R=cpu@chromium.org, rvargas@chromium.org, cpu
> 
> Review URL: https://codereview.chromium.org/31933005

TBR=ananta@chromium.org

Review URL: https://codereview.chromium.org/39303002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@230629 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 230629