Revert of mojo: Add deserialization to python structs.

Revert of mojo: Add deserialization to python structs. (patchset #3 id:40001 of https://codereview.chromium.org/588493002/)

Reason for revert:
Linux Tests mojo_python_bindings_tests failure
http://build.chromium.org/p/chromium.linux/builders/Linux%20Tests/builds/13712

======================================================================
ERROR: testDefaultsTestSerializationDeserialization (bindings_serialization_deserialization_unittest.SerializationDeserializationTest)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/mnt/data/b/build/slave/Linux_Tests/build/src/mojo/python/tests/bindings_serialization_deserialization_unittest.py", line 125, in testDefaultsTestSerializationDeserialization
    v2 = sample_service_mojom.DefaultsTest.Deserialize(data, handles)
  File "/mnt/data/b/build/slave/Linux_Tests/build/src/out/Release/python/mojo/bindings/reflection.py", line 113, in Deserialize
    serialization_object.Deserialize(fields, data, handles)
  File "/mnt/data/b/build/slave/Linux_Tests/build/src/out/Release/python/mojo/bindings/serialization.py", line 82, in Deserialize
    (_, version) = HEADER_STRUCT.unpack_from(data)
TypeError: unpack_from() argument 1 must be string or read-only buffer, not bytearray

Original issue's description:
> mojo: Add deserialization to python structs.
>
> This is a reland of https://codereview.chromium.org/578263003 using
> buffer instead of memoryview, because on some early version of python
> 2.7, memoryview cannot be used with struct.unpack_from.
>
> BUG=415491
> R=sdefresne@chromium.org,cmasone@chromium.org
>
> Committed: https://crrev.com/37dd5f484593b1c8b92b825a9648edf7fb6944e6
> Cr-Commit-Position: refs/heads/master@{#295684}

TBR=cmasone@chromium.org,sdefresne@chromium.org,qsr@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=415491
Committed: https://crrev.com/9db2dffd5345c110d646846e03a9e7ee8a496e04
Cr-Commit-Position: refs/heads/master@{#295689}

[vasilii, 2014-09-19 12:24:29]

Created Revert of mojo: Add deserialization to python structs.

[commit-bot: I haz the power, 2014-09-19 12:24:52]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/584003002/1

[commit-bot: I haz the power, 2014-09-19 12:25:16]

Committed patchset #1 (id:1) as 4bea83b02e5848ca127656bb937ca5fd48908d03

[commit-bot: I haz the power, 2014-09-19 12:25:57]

Patchset 1 (id:??) landed as
https://crrev.com/9db2dffd5345c110d646846e03a9e7ee8a496e04
Cr-Commit-Position: refs/heads/master@{#295689}

[sdefresne, 2014-09-19 12:49:47]

lgtm