Yet more tab strip model changes. I'm hoping this is the last of

it. I'm now going with:

// . Mini-tab. Mini tabs are locked to the left side of the tab strip and
//   rendered differently (small tabs with only a favicon). The model makes
//   sure all mini-tabs are at the beginning of the tab strip. For example,
//   if a non-mini tab is added it is forced to be with non-mini tabs. Requests
//   to move tabs outside the range of the tab type are ignored. For example,
//   a request to move a mini-tab after non-mini-tabs is ignored.
//   You'll notice there is no explcit api for making a tab a mini-tab, rather
//   there are two tab types that are implicitly mini-tabs:
//   . App. Corresponds to an extension that wants an app tab. App tabs are
//     identified by TabContents::is_app().
//   . Pinned. Any tab can be pinned. A pinned tab is made phantom when closed.
//     Non-app tabs whose pinned state is changed are moved to be with other
//     mini-tabs or non-mini tabs.

I'm going with a more neutral name like mini-tabs so that we can
change the meaning if we need to without changing around all the UI
code. I'll convert the UI code next.

BUG=32845
TEST=none

Review URL: http://codereview.chromium.org/570043

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@38237 0039d316-1c4b-4281-b951-d872f2087c98

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