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/PluginHeaderRow.java

@@ -18,10 +18,8 @@ package com.android.launcher3.allapps;
 import static android.view.View.INVISIBLE;
 import static android.view.View.VISIBLE;
 
-import android.graphics.Rect;
 import android.view.View;
 
-import com.android.launcher3.DeviceProfile;
 import com.android.systemui.plugins.AllAppsRow;
 
 /**
@@ -42,9 +40,6 @@ public class PluginHeaderRow implements FloatingHeaderRow {
     public void setup(FloatingHeaderView parent, FloatingHeaderRow[] allRows,
             boolean tabsHidden) { }
 
-    @Override
-    public void setInsets(Rect insets, DeviceProfile grid) { }
-
     @Override
     public int getExpectedHeight() {
         return mPlugin.getExpectedHeight();