This reverts commit 135576ff.

Reason for revert: V8 Win32 ASAN failures: https://build.chromium.org/p/client.v8/builders/V8%20Win32%20ASAN/builds/73

It appears these failures were lurking there already, but were hidden because of the bug this CL fixed. Opened https://crbug.com/v8/6953 about these issues.

Original change's description:
> [test] Fix win-asan symbolizer path
> 
> This makes the symbolizer path relative, as the absolute paths contain
> a drive letter + colon on windows. The colon is confused by the
> sanitizer as an option separator.
> 
> The test driver changes the cwd to the V8 root dir in each
> invocation.
> 
> Bug: chromium:726584
> Change-Id: Icf4e5a55bba5dec8e59a3dfe3eccdf7224e65c33
> Reviewed-on: https://chromium-review.googlesource.com/721124
> Reviewed-by: Sergiy Byelozyorov <sergiyb@chromium.org>
> Commit-Queue: Michael Achenbach <machenbach@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#48652}

TBR=glider@chromium.org,rnk@chromium.org,machenbach@chromium.org,sergiyb@chromium.org,etienneb@chromium.org

Change-Id: Ic78527950f6a239a03658e042d7244c9781d05db
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: chromium:726584
Reviewed-on: https://chromium-review.googlesource.com/723825Reviewed-by: Eric Holk <eholk@chromium.org>
Commit-Queue: Eric Holk <eholk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#48653}