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On newer JB builds, the JNINativeInterface struct appears to be held
in read-only memory so attempting to repoint individual function pointers
in it causes segfault. So instead we repoint the top-level struct pointer
to refer to our own copy held in read/write memory.

BUG=137348
TEST=JNIAndroidTest


Review URL: https://chromiumcodereview.appspot.com/10828050

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@148943 0039d316-1c4b-4281-b951-d872f2087c98