Update android SDK to API version 23.

README.md

 Mojo
 ====
 
 Mojo is an effort to extract a common platform out of Chrome's renderer and
 plugin processes that can support multiple types of sandboxed content, such as
 HTML, Pepper, or NaCl.
 
 ## Set-up and code check-out
 
 The instructions below only need to be done once. Note that a simple "git clone"
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 To build for Android, first make sure that your checkout is [configured](#configure-android) to build
 for Android. After that you can use the mojob script as follows:
 ```
 $ mojo/tools/mojob.py gn --android
 $ mojo/tools/mojob.py build --android
 ```
 
 The result will be in out/android_Debug. If you see javac compile errors,
 [make sure you have an up-to-date JDK](https://code.google.com/p/chromium/wiki/AndroidBuildInstructions#Install_Java_JDK)
 
-#### Marshmallow
-Running mojo on Marshmallow might raise an Exception `"Unable to find fifo"`. As
-a temporary solution, you can go to `Settings` -> `Apps` -> `Mojo Shell (dev)`
--> `Permissions` and allow for `Storage`.
-See this [bug](https://github.com/domokit/mojo/issues/500) for more information.
-
 ### Goma (Googlers only)
 
 If you're a Googler, you can use Goma, a distributed compiler service for
 open-source projects such as Chrome and Android. If Goma is installed in the
 default location (~/goma), it will work out-of-the-box with the `mojob.py gn`,
 `mojob.py build` workflow described above.
 
 You can also manually add:
 ```
 use_goma = true
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 making your first change: [C++ in Chromium
 101](http://dev.chromium.org/developers/cpp-in-chromium-101-codelab).
 
 To land a change after receiving LGTM:
 ```
 $ git cl land
 ```
 
 Don't break the build! Waterfall is here:
 http://build.chromium.org/p/client.mojo/waterfall