Remove settings in overview mode for Launcher3.

The appereance of the settings button in overview mode is now dependent on
a overridable method, such that we can have it in GEL, but not in Launcher3.
This change also adjusts the logic of how wide the overview panel is, depending
on how many items we have.

Bug: 12441429
Change-Id: Ibf537c26602785f565292cbfa213eb123469ebcd
diff --git a/res/values/dimens.xml b/res/values/dimens.xml
index 28b6a5b..1eca5b3 100644
--- a/res/values/dimens.xml
+++ b/res/values/dimens.xml
@@ -25,7 +25,8 @@
     <dimen name="dynamic_grid_workspace_page_spacing">8dp</dimen>
     <dimen name="dynamic_grid_overview_min_icon_zone_height">80dp</dimen>
     <dimen name="dynamic_grid_overview_max_icon_zone_height">120dp</dimen>
-    <dimen name="dynamic_grid_overview_bar_max_width">280dp</dimen>
+    <dimen name="dynamic_grid_overview_bar_item_width">48dp</dimen>
+    <dimen name="dynamic_grid_overview_bar_spacer_width">68dp</dimen>
 
 <!-- Cling -->
     <dimen name="clingPunchThroughGraphicCenterRadius">94dp</dimen>