[Mac] Re-enable pinned tabs; add support for mini-tabs and phantom tabs.

This CL rewires the old support for pinned tabs to support mini-tabs. This also
removes the kEnablePinnedTabs browser default now that all platforms support it.
Note that pinning is now only accessible through the context menu; drag-to-pin
has been removed.

BUG=36798, 32845
TEST=Right-click and pin two tabs. Test dragging on and off and around the tab strip.
TEST=Cmd+W a pinned tab and it should go phantom (renderer closes down) and the tab is made alpha.

Review URL: http://codereview.chromium.org/1119005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@42548 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/chrome/browser/defaults.h b/chrome/browser/defaults.h
index 67497c8a..11dee1f 100644
--- a/chrome/browser/defaults.h
+++ b/chrome/browser/defaults.h
@@ -1,4 +1,4 @@
-// Copyright (c) 2009 The Chromium Authors. All rights reserved.
+// Copyright (c) 2010 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
@@ -64,9 +64,6 @@
 // asking the user for credentials.
 extern const bool kBootstrapSyncAuthentication;
 
-// Are pinned tabs enabled?
-extern const bool kEnablePinnedTabs;
-
 // Should other browsers be shown in about:memory page?
 extern const bool kShowOtherBrowsersInAboutMemory;