fix emulator.py by using Android SDK in third_party/android_tools instead of downloading adt

build/android/pylib/utils/emulator.py

Index: build/android/pylib/utils/emulator.py
diff --git a/build/android/pylib/utils/emulator.py b/build/android/pylib/utils/emulator.py
index 05fb9cfd64579d3cadb8604d0dc53c8bfbe0e3d6..a4222b4f2266ecd9b8433b6014083b852c85f778 100644
--- a/build/android/pylib/utils/emulator.py
+++ b/build/android/pylib/utils/emulator.py
@@ -49,7 +49,7 @@ hw.trackBall=no
 hw.device.name=Galaxy Nexus
 hw.battery=yes
 hw.sensors.proximity=yes
-image.sysdir.1=system-images/android-{api.level}/{abi.type}/
+image.sysdir.1=system-images/android-{api.level}/default/{abi.type}/
 hw.sensors.orientation=yes
 hw.audioInput=yes
 hw.camera.front=none
@@ -234,7 +234,7 @@ class Emulator(object):
       avd_name: name of the AVD to create
       abi: target platform for emulator being created, defaults to x86
     """
-    android_sdk_root = os.path.join(constants.EMULATOR_SDK_ROOT, 'sdk')
+    android_sdk_root = constants.ANDROID_SDK_ROOT
     self.emulator = os.path.join(android_sdk_root, 'tools', 'emulator')
     self.android = os.path.join(android_sdk_root, 'tools', 'android')
     self.popen = None