Revert "Update Android Apps to use gradle"

platform_tools/android/bin/android_setup.sh

 #!/bin/bash
 ###############################################################################
 # Copyright 2015 Google Inc.
 #
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 ###############################################################################
 #
 # android_setup.sh: Sets environment variables used by other Android scripts.
 
@@ skipping 52 matching lines @@
 
 if [ -z "$ANDROID_SDK_ROOT" ]; then
   if ANDROID_SDK_ROOT="$(dirname $(which android))/.."; then
     exportVar ANDROID_SDK_ROOT $ANDROID_SDK_ROOT
   else
      echo "No ANDROID_SDK_ROOT set and can't auto detect it from location of android binary."
      exit 1
   fi
 fi
 
-if [ -z "$ANDROID_HOME" ]; then
-  echo "ANDROID_HOME not set so we are setting it to a default value of ANDROID_SDK_ROOT"
-  exportVar ANDROID_HOME $ANDROID_SDK_ROOT
-fi
-
 # check to see that gclient sync ran successfully
 THIRD_PARTY_EXTERNAL_DIR=${SCRIPT_DIR}/../third_party/externals
 if [ ! -d "$THIRD_PARTY_EXTERNAL_DIR" ]; then
         echo ""
         echo "ERROR: Unable to find the required third_party dependencies needed to build."
         echo "       To fix this add the following line to your .gclient file and run 'gclient sync'"
         echo "        target_os = ['android']"
         echo ""
         exit 1;
 fi
@@ skipping 174 matching lines @@
       adb_push_if_needed $HOST_SRC $ANDROID_DST
     else
       echo -n "$ANDROID_DST "
       $ADB $DEVICE_SERIAL shell mkdir -p "$(dirname "$ANDROID_DST")"
       $ADB $DEVICE_SERIAL push $HOST_SRC $ANDROID_DST
     fi
   fi
 }
 
 setup_device "${DEVICE_ID}"