[NaCl SDK] Fix "make debug" and "make run" on Mac.

There were a couple of issues here:
* make doesn't support spaces, so you have to escape them.
* xterm doesn't exist on mac, use osascript to create a new Terminal window instead.

Also, use the correct basename/default paths for Chrome on each platform.

BUG=322549
[email protected]

Review URL: https://codereview.chromium.org/86053005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@238245 0039d316-1c4b-4281-b951-d872f2087c98
4 files changed