Get rid of extensions dependency from content\browser.

Get rid of extensions dependency from content\browser.

BUG=76789
Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=80315

[jam, 2011-04-03 23:55:15]

In the next cl, I will move dispatching of ExtensionHostMsg_Request (and also
ExtensionHostMsg_PostMessage and the use of DesktopNotificationHandler) to a
common ExtensionMessageDispatcher.  I didn't want to do this in this cl because
it already got large, so I just duplicated the one-line dispatching of
ExtensionHostMsg_Request temporarily.

[Avi (use Gerrit), 2011-04-04 02:55:28]

LGTM as is. Would have liked to have seen fewer uses of
GetCurrentWrapperForContents, but it's OK for now. In the future we can go back
and plumb TCW through much of that code and remove them.

http://codereview.chromium.org/6693054/diff/2113/chrome/browser/ui/tab_conten...
File chrome/browser/ui/tab_contents/tab_contents_wrapper.cc (right):

http://codereview.chromium.org/6693054/diff/2113/chrome/browser/ui/tab_conten...
chrome/browser/ui/tab_contents/tab_contents_wrapper.cc:195:
extension_tab_helper_->extension_app_icon());
Would be nice if you could have a helper function on ExtensionTabHelper like
CloneFrom() so that the TCW didn't need to know so much about the ETH's
internals.

[jam, 2011-04-04 05:56:35]

http://codereview.chromium.org/6693054/diff/2113/chrome/browser/ui/tab_conten...
File chrome/browser/ui/tab_contents/tab_contents_wrapper.cc (right):

http://codereview.chromium.org/6693054/diff/2113/chrome/browser/ui/tab_conten...
chrome/browser/ui/tab_contents/tab_contents_wrapper.cc:195:
extension_tab_helper_->extension_app_icon());
On 2011/04/04 02:55:28, Avi wrote:
> Would be nice if you could have a helper function on ExtensionTabHelper like
> CloneFrom() so that the TCW didn't need to know so much about the ETH's
> internals.

Done.  Since the ETH has already been created, I used CopyStateFrom like TC does
with NavigationController in its Clone.

[Avi (use Gerrit), 2011-04-04 13:56:22]

Much appreciated. SLGTM