Load net-internals resources from resources.pak.

This is the same as r50257 with 2 fixes:
1) Copy resources.pak to <(PRODUCT_DIR) on mac so it will
work for things tests.
2) Add back the check in chrome_paths.cc to see if we're in a
mac bundle or not.

BUG=35793,42770
TEST=none

Review URL: http://codereview.chromium.org/2865010

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@50433 0039d316-1c4b-4281-b951-d872f2087c98
12 files changed