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This is a partial revert of commit 6c4617fc (r282586), "Experimental app
list: Added a current page indicator to the launcher.".

Latest mocks indicate the selected page by changing its icon to blue,
rather than having a blue line above the icon. The reason we are
removing this now is for spacing reasons -- we need to move the grey
separator line up by 1px but the blue line can't be moved up unless we
shrink the contents view.

BUG=411775

Review URL: https://codereview.chromium.org/590023002

Cr-Commit-Position: refs/heads/master@{#295928}