Move content_browser_client.h to public, and while at it, move

Move content_browser_client.h to public, and while at it, move
window_container_type.h as well since it is included by
content_browser_client.h

BUG=98716
TEST=it builds + existing tests

Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=106323

[Jói, 2011-10-18 23:27:11]

WindowContainerType is not an abstract/pure virtual class, but I moved it along
with ContentBrowserClient as it is used by ContentBrowserClient.

Although our goal is to make the public interfaces fairly abstract, I would
suggest that while we're primarily doing renames and file moves we allow some
concrete classes in public (if they are dependencies of the interfaces), and
once we've finished the renames we can make the interfaces more abstract.

Cheers,
Jói

[jam, 2011-10-19 04:29:39]

lgtm