remove non-static uses of SkOncePtr

Still slowly working through all the SK_DECLARE_STATIC_FOO macros.

SkOncePtr is complicating things by having SkOncePtr delete its pointer
and SkBaseOncePtr not.  Simplify things by removing SkOncePtr, leaving
only the leaky SkBaseOncePtr.

We replace SkOncePtr<T> instead with SkOnce and T.  In most cases this
did not need to be a pointer, and in some cases here we're even saving
a few bytes by replacing SkOncePtr<T> with SkOnce and a T.

The dependency map of SK_DECLARE_STATIC_FOO is:
  SkBaseMutex -> SkBaseSemaphore -> SkBaseOncePtr

They're intertwined enough that I think I've got to do all three in one
next CL.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1939503002

Review-Url: https://codereview.chromium.org/1939503002

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