Remove unused PRODUCT_TAGS

Bug: 18895001
Change-Id: I2bbb1c04880218eaa06c1eff92280c636260f9ae
diff --git a/core/product.mk b/core/product.mk
index 08cf5e9..166b583 100644
--- a/core/product.mk
+++ b/core/product.mk
@@ -85,7 +85,6 @@
     PRODUCT_EXTRA_RECOVERY_KEYS \
     PRODUCT_PACKAGE_OVERLAYS \
     DEVICE_PACKAGE_OVERLAYS \
-    PRODUCT_TAGS \
     PRODUCT_SDK_ATREE_FILES \
     PRODUCT_SDK_ADDON_NAME \
     PRODUCT_SDK_ADDON_COPY_FILES \
diff --git a/core/product_config.mk b/core/product_config.mk
index 6d35ccb..019a61c 100644
--- a/core/product_config.mk
+++ b/core/product_config.mk
@@ -361,9 +361,6 @@
 DEVICE_PACKAGE_OVERLAYS := \
         $(strip $(PRODUCTS.$(INTERNAL_PRODUCT).DEVICE_PACKAGE_OVERLAYS))
 
-# An list of whitespace-separated words.
-PRODUCT_TAGS := $(strip $(PRODUCTS.$(INTERNAL_PRODUCT).PRODUCT_TAGS))
-
 # The list of product-specific kernel header dirs
 PRODUCT_VENDOR_KERNEL_HEADERS := \
     $(PRODUCTS.$(INTERNAL_PRODUCT).PRODUCT_VENDOR_KERNEL_HEADERS)
diff --git a/core/tasks/product-graph.mk b/core/tasks/product-graph.mk
index aa98758..c095c0f 100644
--- a/core/tasks/product-graph.mk
+++ b/core/tasks/product-graph.mk
@@ -109,7 +109,6 @@
 	$(hide) echo 'PRODUCT_EXTRA_RECOVERY_KEYS=$$(PRODUCTS.$(strip $(1)).PRODUCT_EXTRA_RECOVERY_KEYS)' >> $$@
 	$(hide) echo 'PRODUCT_PACKAGE_OVERLAYS=$$(PRODUCTS.$(strip $(1)).PRODUCT_PACKAGE_OVERLAYS)' >> $$@
 	$(hide) echo 'DEVICE_PACKAGE_OVERLAYS=$$(PRODUCTS.$(strip $(1)).DEVICE_PACKAGE_OVERLAYS)' >> $$@
-	$(hide) echo 'PRODUCT_TAGS=$$(PRODUCTS.$(strip $(1)).PRODUCT_TAGS)' >> $$@
 	$(hide) echo 'PRODUCT_SDK_ADDON_NAME=$$(PRODUCTS.$(strip $(1)).PRODUCT_SDK_ADDON_NAME)' >> $$@
 	$(hide) echo 'PRODUCT_SDK_ADDON_COPY_FILES=$$(PRODUCTS.$(strip $(1)).PRODUCT_SDK_ADDON_COPY_FILES)' >> $$@
 	$(hide) echo 'PRODUCT_SDK_ADDON_COPY_MODULES=$$(PRODUCTS.$(strip $(1)).PRODUCT_SDK_ADDON_COPY_MODULES)' >> $$@