Filter out a few more files from NaCl build of base/
Filter out a few more files from NaCl build of base/

Some files like important_file_writer, and stack_trace will
fail to link if they are ever linked in, because what they
depend on has already been filtered out (file_util,
file_util_posix and stack_trace_posix).

Others just don't seem necessary (parts of base/process/).

This helps a little w/ an upcoming pnacl LLVM 3.6 merge,
but doesn't fully solve a linking problem. Otherwise
it's fewer files to build w/ a NaCl compiler.

BUG= https://code.google.com/p/nativeclient/issues/detail?id=4026

Review URL: https://codereview.chromium.org/870863003

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#312852}

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