Revert of [coverage] Filter some files from instrumentation. (patchset #3 id:40001 of https://codereview.chromium.org/1730543002/ )

Reason for revert:
This breaks `gclient sync` because v8_target_arch isn't defined.

gyp: name 'v8_target_arch' is not defined while evaluating condition
'(OS=="linux" or OS=="mac") and (target_arch=="ia32" or target_arch=="x64") and
         (v8_target_arch!="x87" and v8_target_arch!="x32") and coverage==0' in
/media/jfb/ssd/v8/v8/build/all.gyp
Error: Command '/usr/bin/python v8/build/gyp_v8' returned non-zero exit status 1
in /media/jfb/ssd/v8

Original issue's description:
> [coverage] Filter some files from instrumentation.
>
> This filters test and third_party files to get a speed-up
> when running tests and when collecting profile data.
>
> BUG=chromium:568949
> LOG=n
>
> Committed: https://crrev.com/761ee31be5ab4fde05c294e5d632608fbaea8ad4
> Cr-Commit-Position: refs/heads/master@{#34216}
>
> Committed: https://crrev.com/906db7448702a6ac9fab2a445c57cc85f6dd1b1a
> Cr-Commit-Position: refs/heads/master@{#34253}

TBR=tandrii@chromium.org,kjellander@chromium.org,machenbach@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=chromium:568949

Review URL: https://codereview.chromium.org/1737433002

Cr-Commit-Position: refs/heads/master@{#34258}