The goal of this change is to include the DIA SDK (and strip out
a bit extra that was unnecessary).

Unfortunately, the msi that includes the DIA SDK includes a file with an
extraordinarily long path, 241 characters long. When prepended with
"C:\Program Files (x86)\" it extracts OK, however, when we extract to
%TEMP% it's not hard for it to exceed _MAX_PATH and have the msi tool
fail. So, when extracting MSIs, also do the equivalent of
"subst X: temp_dir" and use X:\ as the path given to msiexec. (sigh)

R=maruel@chromium.org
BUG=323300

Review URL: https://codereview.chromium.org/150333005

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@251085 0039d316-1c4b-4281-b951-d872f2087c98