Merge V8 API updates to xfa branch

Set pointers in internal fields directly instead of wrapping them
Review URL: https://codereview.chromium.org/1139853003

Use phantom handles instead of weak handles
Review URL: https://codereview.chromium.org/1129253004

Replace deprecated with non-deprecated V8 APIs
Review URL: https://codereview.chromium.org/1126203010

Add myself to OWNERS file
Review URL: https://codereview.chromium.org/1133333005

Replace v8::Handle with v8::Local and v8::Persistent with v8::Global
Review URL: https://codereview.chromium.org/1138823004

TBR=tsepez@chromium.org
BUG=

Review URL: https://codereview.chromium.org/1140033004
24 files changed