Move MessageWindow out into its own file. BrowserInit is now cross-platform-capable.

Fix up the header includes in browser_init.cc/h removing a bunch of windows stuff.

Review URL: http://codereview.chromium.org/19034

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@8762 0039d316-1c4b-4281-b951-d872f2087c98
7 files changed