Use MaybeLocal versions of v8::Script APIs

The non-Maybe versions will soon be deprecated.

Where the code was already handling failures, I did the same; where the
code was not handling failures, I inserted ToLocalChecked() calls. Thus
the behavior before and after this patch should be the same.

For consistency, also updated the use of v8::Function::Call
in CFXJSE_Context::ExecuteScript() to the Maybe version, so
that all code in that function now branches on the non-emptyness
of MaybeLocals, rather than TryCatch::HasCaught(). ASSERTs were
inserted to sanity-check the API usage.

Bug: v8:7269, v8:7273, v8:7274
Change-Id: I59696e63a64a233a9f9c2b72c621a05b5e349a31
Reviewed-on: https://pdfium-review.googlesource.com/23270
Commit-Queue: Jochen Eisinger <jochen@chromium.org>
Reviewed-by: Jochen Eisinger <jochen@chromium.org>

0 files changed, 0 insertions, 0 deletions