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On tablets, the layout for the location bar is overridden by the XML
in layout-sw600dp, which means instead of the url_action_container used
elsewhere, it's a series of FrameLayouts for action buttons with
manually calculated margins.

This CL breaks the url_action_container into its own file to be included
on both phone and tablet, and gets rid of the tablet-specific layout
update for calculating the margin of the action buttons.

Bug: 820273
Change-Id: I104551325f49dbee0931e9a55c105d61e55f7796
Reviewed-on: https://chromium-review.googlesource.com/971404Reviewed-by: Matthew Jones <mdjones@chromium.org>
Reviewed-by: Yusuf Ozuysal <yusufo@chromium.org>
Commit-Queue: Troy Hildebrandt <thildebr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#548580}