BrowserMain() refactoring, part 2.1.

1. Move InitializeSSL() into platform-specific files and eliminate #ifdef.
2. Add some instructions on how to add code to BrowserMain().

BUG=none
TEST=everything still works

Review URL: http://codereview.chromium.org/3073008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@54098 0039d316-1c4b-4281-b951-d872f2087c98
5 files changed