Removing tabWidth calculation and using DeviceProfile directly

This removes some dependency on FloatingHeaderView, making it
easier to replace

Bug: 234008165
Test: Verified that the UI does not change
Change-Id: I363c98c23f84fe570ea9cb1a40128359f5b67c9f
Merged-In: I363c98c23f84fe570ea9cb1a40128359f5b67c9f
(cherry picked from commit 42b640404a)
Merged-In: I363c98c23f84fe570ea9cb1a40128359f5b67c9f

src/com/android/launcher3/allapps/FloatingHeaderRow.java

@@ -15,11 +15,8 @@
  */
 package com.android.launcher3.allapps;
 
-import android.graphics.Rect;
 import android.view.View;
 
-import com.android.launcher3.DeviceProfile;
-
 /**
  * A abstract representation of a row in all-apps view
  */
@@ -29,8 +26,6 @@ public interface FloatingHeaderRow {
 
     void setup(FloatingHeaderView parent, FloatingHeaderRow[] allRows, boolean tabsHidden);
 
-    void setInsets(Rect insets, DeviceProfile grid);
-
     int getExpectedHeight();
 
     /**