Do not set ANDROID_SDK_ROOT so it uses default from android_tools.

build/android/buildbot_functions.sh

 #!/bin/bash
 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 #
 # Bash functions used by buildbot annotator scripts for the android
 # build of chromium.  Executing this script should not perform actions
 # other than setting variables and defining of functions.
 
 # Number of jobs on the compile line; e.g.  make -j"${JOBS}"
@@ skipping 17 matching lines @@
       *)
         echo "@@@STEP_WARNINGS@@@"
         echo "Warning, unparsed input argument: '$1'"
         ;;
     esac
     shift
   done
 }
 
 
-# Setup environment for Android build.
+# Setup environment for Android build.  Do not set ANDROID_SDK_ROOT so that
+# default version from $ROOT/src/third_party/android_tools/
 # Called from bb_baseline_setup.
 # Moved to top of file so it is easier to find.
 function bb_setup_environment {
-  export ANDROID_SDK_ROOT=/usr/local/google/android-sdk-linux
   export ANDROID_NDK_ROOT=/usr/local/google/android-ndk-r7
 }
 
 # Install the build deps by running
 # build/install-build-deps-android-sdk.sh.  This may update local tools.
 # $1: source root.
 function bb_install_build_deps {
   echo "@@@BUILD_STEP install build deps android@@@"
   local script="$1/build/install-build-deps-android-sdk.sh"
   if [[ -f "$script" ]]; then
@@ skipping 239 matching lines @@
     --factory-properties "$FACTORY_PROPERTIES" \
     --build-properties "$BUILD_PROPERTIES"
   extract_exitcode=$?
   if (( $extract_exitcode > 1 )); then
     echo "@@@STEP_WARNINGS@@@"
     return
   fi
   return $extract_exitcode
   )
 }