Revert 109822 - Reenable the out-of-process PPAPI Instance (ui) test.

[Nope, definitely flaky. Timed out on Linux.]

The bug is uninformative and I don't see how this out-of-process test can be any
flakier than the other out-of-process tests (for the example failure in the
bug). So let's try reenabling it.

BUG=91729
TBR=dmichael@chromium.org

Review URL: http://codereview.chromium.org/8530004

TBR=viettrungluu@chromium.org,dmichael@chromium.org
Review URL: http://codereview.chromium.org/8548004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@109824 0039d316-1c4b-4281-b951-d872f2087c98

chrome/test/ui/ppapi_uitest.cc

@@ -165,7 +165,8 @@ TEST_PPAPI_IN_PROCESS(CursorControl)
 TEST_PPAPI_OUT_OF_PROCESS(CursorControl)
 
 TEST_PPAPI_IN_PROCESS(Instance)
-TEST_PPAPI_OUT_OF_PROCESS(Instance)
+// http://crbug.com/91729
+TEST_PPAPI_OUT_OF_PROCESS(DISABLED_Instance)
 
 TEST_PPAPI_IN_PROCESS(Graphics2D)
 TEST_PPAPI_OUT_OF_PROCESS(Graphics2D)