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CheckedPtr requires C++11 - including checked_ptr.h will cause
compilation errors when compiling C-only sources.  This CL suppresses
rewrites if the clang::CompilerInstance indicates that it is compiling
a C-only source file.

Additionally, the CL excludes from the rewrite fields declared under a
|extern "C"| declaration context - such context is a strong hint that
1) the struct might need to be used from a C-only source and
2) the struct needs strict ABI compatibility (not guaranteed by the
   CheckedPtr which might repurpose some bits of the pointer).

Bug: 1069567
Change-Id: Ib146acbf1f5ae075c2498c000104cebe9cc36b71
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2181527Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Bartek Nowierski <bartekn@chromium.org>
Commit-Queue: Łukasz Anforowicz <lukasza@chromium.org>
Cr-Commit-Position: refs/heads/master@{#774754}