Migrate uses of config_windowIsRound to Configuration.isScreenRound

Move existing code that previously relied on config_windowIsRound to
use the new Configuration.isScreenRound() method. Also move the system
property override for emulators over to the initial setup of a Display
so that the configuration property is consistent with existing
expectations.

Remove config_windowIsRound from symbols.xml. The symbol now only
exists as a default value redirect for overlays already configured to
supply this value.

Change-Id: I24e6564030a6051c3ac7262868983b43e13eee65
diff --git a/services/core/java/com/android/server/wm/AccessibilityController.java b/services/core/java/com/android/server/wm/AccessibilityController.java
index 91ce739..482ae24 100644
--- a/services/core/java/com/android/server/wm/AccessibilityController.java
+++ b/services/core/java/com/android/server/wm/AccessibilityController.java
@@ -432,8 +432,7 @@
                 mDrawBorderInset = (int) mBorderWidth / 2;
                 mWindow = new ViewportWindow(mContext);
 
-                if (mContext.getResources().getBoolean(
-                            com.android.internal.R.bool.config_windowIsRound)) {
+                if (mContext.getResources().getConfiguration().isScreenRound()) {
                     mCircularPath = new Path();
                     mWindowManager.getDefaultDisplay().getRealSize(mTempPoint);
                     final int centerXY = mTempPoint.x / 2;