Symbolize crashes for the Windows perf builder.

BUG=323782
TEST=crashes on Win7 Perf bot should be symbolized.

Review URL: https://codereview.chromium.org/90233003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@237762 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 237762