Escape slashes in paths in windows tool bootstrapping.
Escape slashes in paths in windows tool bootstrapping.

Otherwise the 7zip extraction process will interpret them as escape
chars.

BUG=595883
R=martiniss@chromium.org, mmoss@chromium.org

Review URL: https://codereview.chromium.org/1848153002 .

git-svn-id: fd409f4bdeea2bb50a5d34bb4d4bfc2046a5a3dd@299611 0039d316-1c4b-4281-b951-d872f2087c98

CoherentLabs/depot_tools,primiano/depot_tools,primiano/depot_tools,primiano/depot_tools,CoherentLabs/depot_tools