Cherry-picks WebKit change 56105 to eliminate use of bzero in WebKit common code

Note that manual changes were required to JNIUtilityPrivate.cpp as this file has
changed upstreamed, but the merge will be trivial.

See http://trac.webkit.org/changeset/56105

Bug: 2535696
Change-Id: I08da8279d3af93aba38ecf21731c8a251502abae
Merge commit '27ec2eed4cd59f9a3311789d4fa99829e3e67e20' into oxygen_4.3

* commit '27ec2eed4cd59f9a3311789d4fa99829e3e67e20':
  Cherry-picks WebKit change 56105 to eliminate use of bzero in WebKit common code