[Extensions Toolbar Mac] Fix actions bar min size, spacing
Adjust the minimum size of the browser actions bar with the toolbar redesign
enabled from 10 to 3. Make the browser actions bar handle any padding required
between itself, the omnibox, and the wrench menu button. Increase the padding
between extension actions from 2 to 3 for consistency (this matches the distance
between the omnibox and the wrench when no extensions are present and views
platforms implementations).
XIB changes (all in Toolbar.xib):
* Make the BrowserActionsContainerView have 0 width - since the width is
completely dynamic, it makes our calculations easier to just not include it.
* Make the wrench button start at X:572 (the same as the
BrowserActionsContainerView). Padding is now included in the size of the bar.
BUG=429810
Review URL: https://codereview.chromium.org/
863833002
Cr-Commit-Position: refs/heads/master@{#312670}