Android: Always push md5sum_bin to the device.

build/android/pylib/android_commands.py

Index: build/android/pylib/android_commands.py
diff --git a/build/android/pylib/android_commands.py b/build/android/pylib/android_commands.py
index 2b412f31be3279a2833f851606ad77fcb30f2856..e1aa37ee06cc0e6e10e5d0369aea6d4503773f82 100644
--- a/build/android/pylib/android_commands.py
+++ b/build/android/pylib/android_commands.py
@@ -548,9 +548,8 @@ class AndroidCommands(object):
         if not os.path.exists(md5sum_path):
           print >>sys.stderr, 'Please build md5sum.'
           sys.exit(1)
-      if not self.FileExistsOnDevice(MD5SUM_DEVICE_PATH):
-        command = 'push %s %s' % (md5sum_path, MD5SUM_DEVICE_PATH)
-        assert _HasAdbPushSucceeded(self._adb.SendCommand(command))
+      command = 'push %s %s' % (md5sum_path, MD5SUM_DEVICE_PATH)
+      assert _HasAdbPushSucceeded(self._adb.SendCommand(command))
       self._md5sum_path = md5sum_path
 
     self._pushed_files.append(device_path)