SERVER-13686 Add V8 3.25.28.14 (SHA1 92cf0d798d3ad54a903818815286dd83a3ea5f63) to src/third_party/v8-3.25

Using the following:

Clone git://github.com/v8/v8 into temporary directory
Extract snapshot using git archive:
    git archive 92cf0d798d3ad54a903818815286dd83a3ea5f63 > v8-3.25.tar
Unpack 3.25.tar into src/third_party/v8-3.25
Generate trig-table.cc.
Reduce the size of src/third_party/v8-3.25:
    rm -rf benchmarks/ \
           build/ \
           codereview.settings \
           DEPS \
           WATCHLISTS \
           Makefile \
           Makefile.android \
           Makefile.nacl \
           samples/ \
           test/ \
           tools/