Disable set -e for extract build step

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"${JOBS}"
@@ skipping 248 matching lines @@
     --build-properties "$BUILD_PROPERTIES"
 }
 
 # Download and extract a build.
 function bb_extract_build {
   echo "@@@BUILD_STEP Download and extract build@@@"
   if [[ -z $FACTORY_PROPERTIES || -z $BUILD_PROPERTIES ]]; then
     return 1
   fi
 
+  # When extract_build.py downloads an unversioned build it
+  # issues a warning by exiting with large numbered return code
+  # When it fails to download it build, it exits with return
+  # code 1.  We disable halt on error mode and return normally
+  # unless the python tool returns 1.
+  (
+  set +e
   python ../../../../scripts/slave/extract_build.py \
     --build-dir "$SRC_ROOT" \
     --build-output-dir "out" \
     --target Release \
     --factory-properties "$FACTORY_PROPERTIES" \
     --build-properties "$BUILD_PROPERTIES"
+  extract_exitcode=$?
+  if (( $extract_exitcode > 1 )); then
+    echo "@@@STEP_WARNINGS@@@"
+    return
+  fi
+  return $extract_exitcode
+  )
 }