Mojo: Move PlatformChannelPair to its own files.

(platform_channel_posix.cc gets moved to platform_channel_pair_posix.cc
entirely.)

R=darin@chromium.org

Review URL: https://codereview.chromium.org/133533007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@244234 0039d316-1c4b-4281-b951-d872f2087c98
Remove empty chrome_frame directory.


git-svn-id: svn://svn.chromium.org/chrome/trunk/src@244235 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 244235
app_shell: Fix PrefsTabHelper dependency of ExtensionHost

The default preference values are fine for app_shell's pages (as they are
for content_shell, which doesn't use PrefsTabHelper).  Delegate out the
creation of PrefsTabHelper so we only create them in Chrome.

With this patch app_shell can launch a renderer before crashing.

BUG=332435
TEST=browser_tests, manual testing that extensions still work

Review URL: https://codereview.chromium.org/132993002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@244236 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 244236