The C++ standard library uses the name "release" for the operation we call "detach".
Rewriting each "detach(" to "release(" brings us a step closer to using standard library types directly (e.g. std::unique_ptr instead of SkAutoTDelete).
This was a fairly blind transformation. There may have been unintentional conversions in here, but it's probably for the best to have everything uniformly say "release".
BUG=skia:
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Remove SkWindow::onPDFSaved, it does not work and it is not used anymore.
Also, it is very SampleApp -specific feature implemented in SkWindow class.
SkWindow class is probably intended to be more app-agnosting than
what this method implies.
Presumably the idea of the callback was to inform the user of
SampleApp that the PDF was saved to a certain location.
For Android SampleApp, show a hardcoded toast that the PDF was saved to
/sdcard.
BUG=skia:4733
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Review URL: https://codereview.chromium.org/1547923002
