Fix inconsist color filling on collapsing toolbar

Some pages are updating the background color for action bar after action
bar is created, which will break the animation of collapsing toolbar. It
also causes the different color filled in the status bar and collapsing
toolbar area separately. Removing the styleActionbar method from
EntityHeaderController can fix this issue.

Fix: 187019164
Test: robotests && visual verified
1) Settings -> Apps -> See all apps -> pick up either app -> Mobile data
& Wi-Fi
2) Scrolling the content and see if the toolbar has the different color
between status bar and toolbar

Change-Id: Ic0842b9e6c48662872694534a3696c4b8900481f