Remove webkit flags

we don't build webkit anymore on 4.4

Change-Id: Ia78c5c120293a9cbf288db20ed536aed29bb6411
Disable GL preload

Fix legacy fb on kitkat

Change-Id: Ibacd16c2e82ebd965f210b1d5df3248eab965985
Enable EGL_WORKAROUND_BUG_10194508

Change-Id: I86e9168b950c2767e96128a762b7ee88e8f7874e