Remove isFactoryROM method from PropertyUtil class

bug:125493228
Test: run gts -m GtsPlacementTestCases
Change-Id: I3be13be4b8507cd7859e8d6816573f2348eeae10
diff --git a/common/device-side/util-axt/src/com/android/compatibility/common/util/PropertyUtil.java b/common/device-side/util-axt/src/com/android/compatibility/common/util/PropertyUtil.java
index 285b732..599110e 100644
--- a/common/device-side/util-axt/src/com/android/compatibility/common/util/PropertyUtil.java
+++ b/common/device-side/util-axt/src/com/android/compatibility/common/util/PropertyUtil.java
@@ -53,12 +53,6 @@
         return propertyEquals(BUILD_TYPE_PROPERTY, "user");
     }
 
-    /** Returns whether the device build is the factory ROM */
-    public static boolean isFactoryROM() {
-        // property should be undefined if and only if the product is factory ROM.
-        return getPropertyInt(FIRST_API_LEVEL) == INT_VALUE_IF_UNSET;
-    }
-
     /** Returns whether this build is built with dev-keys */
     public static boolean isDevKeysBuild() {
         for (String tag : Build.TAGS.split(",")) {
diff --git a/common/device-side/util/src/com/android/compatibility/common/util/PropertyUtil.java b/common/device-side/util/src/com/android/compatibility/common/util/PropertyUtil.java
index b98acee..c95b8df 100644
--- a/common/device-side/util/src/com/android/compatibility/common/util/PropertyUtil.java
+++ b/common/device-side/util/src/com/android/compatibility/common/util/PropertyUtil.java
@@ -53,12 +53,6 @@
         return propertyEquals(BUILD_TYPE_PROPERTY, "user");
     }
 
-    /** Returns whether the device build is the factory ROM */
-    public static boolean isFactoryROM() {
-        // property should be undefined if and only if the product is factory ROM.
-        return getPropertyInt(FIRST_API_LEVEL) == INT_VALUE_IF_UNSET;
-    }
-
     /** Returns whether this build is built with dev-keys */
     public static boolean isDevKeysBuild() {
         for (String tag : Build.TAGS.split(",")) {