Make the version number a single number on native and java side.
Also, remove the hasValidContents method. It's useless since the
native code already checks this when creating the dictionary (I
wish I had known that when I added it).

Bug: 11281748
Change-Id: I572d37429972b2f280e4bdb748b709e5d0d7737e

This implements the skeleton implementation, and enables a
fallback implementation in the case the file is coming from the
dictionary provider.
- A better scheme should be used for provider-supplied dicts.
- This does not implement the solution for device-generated
    dicts yet. This will come in a future change.
- This does not implement the checking process on the native
    side yet. This will come in a future change.

Bug: 11281748
Change-Id: Ifa6e237d19dfbffe503e3674915480ea867b0ddf

cherrypick of Iaa9b79fc770d8ae2ec9d7c362c90c28bc9f65ea8

Bug: 10964805
Change-Id: Id5e67b00bf9594be0591c87407a78146297e0e78

cherrypick of Iaa9b79fc770d8ae2ec9d7c362c90c28bc9f65ea8

Bug: 10964805
Change-Id: Id5e67b00bf9594be0591c87407a78146297e0e78

Bug: 10964805
Change-Id: Iaa9b79fc770d8ae2ec9d7c362c90c28bc9f65ea8