Stop using the a* pattern for method input parameters

[hicklin]

Following this PR comment, this issue is to track the removal of the a* pattern for method input parameters.

[bzbarsky-apple]

I am fine with that if we also get rid of the "p" and "mp" prefixes....

What is the plan for the "m" and "s" prefixes for members?

That said, I should note that contrary to the PR comment cited above "a" prefixes are not "Hungarian style". Hungarian style is when the type is encoded into the name. This is encoding semantic/lifetime information, not the type.

[hicklin]

Is there a "standard" or at least "preferred" style guide for matter? So far I have been trying to mimic what I have seen elsewhere in the SDK. Sometimes I happen to choose the wrong example.

[bzbarsky-apple]

There is not. For new files, it's people doing whatever they want. For existing files, follow file style.