Remove Droid Sans Fallback from all builds

Droid Sans Fallback is now completely replaced by Noto Sans CJK. The
font files are kept in the tree, since the SDK still needs them.

Also, Android.mk is updated to reflect the fact that Noto Color Emoji
is now included in SMALLER_FONT_FOOTPRINT, so fontchain_lint checks
for emoji consistency in that footprint too.

Bug: 31854008
Test: make fontchain_lint
Change-Id: I4f57114a48ecfaee87b49f01f7ef4fa5cd0b19fb

data/fonts/Android.mk

@@ -13,7 +13,7 @@
 # limitations under the License.
 
 # We have to use BUILD_PREBUILT instead of PRODUCT_COPY_FIES,
-# because SMALLER_FONT_FOOTPRINT is only available in Android.mks.
+# because MINIMAL_FONT_FOOTPRINT is only available in Android.mks.
 
 LOCAL_PATH := $(call my-dir)
 
@@ -58,21 +58,6 @@ LOCAL_REQUIRED_MODULES := $(extra_font_files)
 include $(BUILD_PREBUILT)
 extra_font_files :=
 
-################################
-# Include the DroidSansFallback subset on SMALLER_FONT_FOOTPRINT build
-ifeq ($(SMALLER_FONT_FOOTPRINT),true)
-
-include $(CLEAR_VARS)
-LOCAL_MODULE := DroidSansFallback.ttf
-LOCAL_SRC_FILES := $(LOCAL_MODULE)
-LOCAL_MODULE_CLASS := ETC
-LOCAL_MODULE_TAGS := optional
-LOCAL_MODULE_PATH := $(TARGET_OUT)/fonts
-include $(BUILD_PREBUILT)
-droidsans_fallback_src :=
-
-endif  # SMALLER_FONT_FOOTPRINT
-
 ################################
 # Build the rest of font files as prebuilt.
 
@@ -101,7 +86,7 @@ font_src_files :=
 checkbuild: fontchain_lint
 
 FONTCHAIN_LINTER := frameworks/base/tools/fonts/fontchain_lint.py
-ifeq ($(SMALLER_FONT_FOOTPRINT),true)
+ifeq ($(MINIMAL_FONT_FOOTPRINT),true)
 CHECK_EMOJI := false
 else
 CHECK_EMOJI := true

data/fonts/fonts.mk

@@ -18,6 +18,5 @@ PRODUCT_COPY_FILES := \
     frameworks/base/data/fonts/fonts.xml:$(TARGET_COPY_OUT_SYSTEM)/etc/fonts.xml
 
 PRODUCT_PACKAGES := \
-    DroidSansFallback.ttf \
     DroidSansMono.ttf \
-    AndroidClock.ttf \
+    AndroidClock.ttf

data/fonts/fonts.xml

@@ -353,9 +353,6 @@
     <family lang="und-Zsym">
         <font weight="400" style="normal">NotoSansSymbols-Regular-Subsetted2.ttf</font>
     </family>
-    <family>
-        <font weight="400" style="normal">DroidSansFallback.ttf</font>
-    </family>
     <!--
         Tai Le and Mongolian are intentionally kept last, to make sure they don't override
         the East Asian punctuation for Chinese.