Update emulator to work with version 18 of Android API.

Downloads correct dependencies and updates the paths in avd config.

BUG=249712

Review URL: https://chromiumcodereview.appspot.com/23475032

git-svn-id: http://src.chromium.org/svn/trunk/src/build@222612 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

android/avd_configs/AVD_for_Galaxy_Nexus_by_Google_arm.avd/config.ini

@@ -22,7 +22,7 @@ hw.trackBall=no
 hw.device.name=Galaxy Nexus
 hw.battery=yes
 hw.sensors.proximity=yes
-image.sysdir.1=system-images/android-17/armeabi-v7a/
+image.sysdir.1=system-images/android-18/armeabi-v7a/
 hw.sensors.orientation=yes
 hw.audioInput=yes
 hw.camera.front=none

android/avd_configs/AVD_for_Galaxy_Nexus_by_Google_x86.avd/config.ini

@@ -21,7 +21,7 @@ hw.trackBall=no
 hw.device.name=Galaxy Nexus
 hw.battery=yes
 hw.sensors.proximity=yes
-image.sysdir.1=system-images/android-17/x86/
+image.sysdir.1=system-images/android-18/x86/
 hw.sensors.orientation=yes
 hw.audioInput=yes
 hw.camera.front=none

android/install_emulator_deps.py

@@ -21,7 +21,7 @@ from pylib.utils import run_tests_helper
 
 # Android x86 system image from the Intel website:
 # http://software.intel.com/en-us/articles/intel-eula-x86-android-4-2-jelly-bean-bin
-X86_IMG_URL = 'http://download-software.intel.com/sites/landingpage/android/sysimg_x86-17_r01.zip'
+X86_IMG_URL = 'http://download-software.intel.com/sites/landingpage/android/sysimg_x86-18_r01.zip'
 
 # Android API level
 API_TARGET = 'android-%s' % constants.ANDROID_SDK_VERSION