[Android] DeviceUtils change to make Install work without md5 binary.

build/android/pylib/constants/__init__.py

 # 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.
 
 """Defines a set of constants shared by test runners and other scripts."""
 
 # TODO(jbudorick): Split these constants into coherent modules.
 
 # pylint: disable=W0212
 
@@ skipping 211 matching lines @@
 VALID_ENVIRONMENTS = ['local', 'remote_device']
 VALID_TEST_TYPES = ['gtest', 'instrumentation', 'junit', 'linker', 'monkey',
                     'perf', 'python', 'uiautomator', 'uirobot']
 VALID_DEVICE_TYPES = ['Android', 'iOS']
 
 
 def GetBuildType():
   try:
     return os.environ['BUILDTYPE']
   except KeyError:
-    raise Exception('The BUILDTYPE environment variable has not been set')
+    raise EnvironmentError(
+        'The BUILDTYPE environment variable has not been set')
 
 
 def SetBuildType(build_type):
   os.environ['BUILDTYPE'] = build_type
 
 
 def SetBuildDirectory(build_directory):
   os.environ['CHROMIUM_OUT_DIR'] = build_directory
 
 
@@ skipping 51 matching lines @@
       subprocess.call(['adb', 'version'], stdout=devnull, stderr=devnull)
     return 'adb'
   except OSError:
     logging.debug('No adb found in $PATH, fallback to checked in binary.')
     return os.path.join(ANDROID_SDK_ROOT, 'platform-tools', 'adb')
 
 # Exit codes
 ERROR_EXIT_CODE = 1
 INFRA_EXIT_CODE = 87
 WARNING_EXIT_CODE = 88