Revert of Make TAG() really return an unsigned number. (https://codereview.chromium.org/377443004/)
Revert of Make TAG() really return an unsigned number. (https://codereview.chromium.org/377443004/)

Reason for revert:
Breaks ContainerNamesTest.CheckFixedStrings test

Original issue's description:
> Make TAG() really return an unsigned number.
> 
> Previous attempt: https://codereview.chromium.org/369193002/
> This didn't work because C's integer promotion rules say that
> numeric types smaller than int (i.e. signed and unsiged char
> and short) are implicitly converted to int, so
>   static_cast<uint8>(a) << 24u
> is really
>   (int)(static_cast<uint8>(a)) << 24u
> and an int shifted by a (signed or unsigned) int is an int.
> 
> As a fix, cast to uint32 instead of uint8. (But the best fix
> would be to rewrite this with an inline function.)
> 
> BUG=82385
> TBR=acolwell@chromium.org
> NOTRY=true
> 
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=281492

TBR=acolwell@chromium.org,thakis@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=82385

Review URL: https://codereview.chromium.org/373733002

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@281493 0039d316-1c4b-4281-b951-d872f2087c98

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