Roll Android SDK in android_tools repo to api version 16.

build/android/envsetup_functions.sh

Index: build/android/envsetup_functions.sh
diff --git a/build/android/envsetup_functions.sh b/build/android/envsetup_functions.sh
index 9b8083d5429c5aa1cef78ae183fa5c139dc2a0bc..0c7a2a0db821a96d1f55b0400e60e5cb4d1e25c7 100755
--- a/build/android/envsetup_functions.sh
+++ b/build/android/envsetup_functions.sh
@@ -165,8 +165,6 @@ sdk_build_init() {
   # Set default target.
   export TARGET_PRODUCT="${TARGET_PRODUCT:-trygon}"
 
-  # Android sdk platform version to use
-  export ANDROID_SDK_VERSION=15
   # Unset toolchain so that it can be set based on TARGET_PRODUCT.
   # This makes it easy to switch between architectures.
   unset ANDROID_TOOLCHAIN
@@ -226,9 +224,6 @@ non_sdk_build_init() {
   # We export "ANDROID_NDK_ROOT" for building Chromium for Android by NDK.
   export ANDROID_NDK_ROOT=${ANDROID_BUILD_TOP}/prebuilts/ndk/android-ndk-r7
 
-  # Android sdk platform version to use
-  export ANDROID_SDK_VERSION=15
-
   # We export "ANDROID_SDK_ROOT" for building Java source with the SDK.
   export ANDROID_SDK_ROOT=${ANDROID_BUILD_TOP}/prebuilts/sdk/\
 ${ANDROID_SDK_VERSION}