Revert "core: ViewGroup: add null check for ActivityTrigger"

This reverts commit c7959ddedf91c08b7bd13cf1b43a6d145e208a48.
Revert "core: fix/cleanup for CAF ActivityTrigger+Performance"

This reverts commit 6f7357e3b6b4b3e3ac52e82fab6f367a13375d9c.
Revert "performance: Add concurrency and timer support to PerfLock."

This reverts commit 78c4df68811faebc2e4c7ce7886d935f7e6f5648.
Revert "performance: Add Performance class and PerfLock API."

This reverts commit 17fbef4d5403b3b28d707bd6a391ff7335736472.
Revert "framework: [webkit] calling perfLock interface when chrome browser"

This reverts commit 14135aa66698cfdff055cd2d84e4695c1bdb7c7c.