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Make a context struct for ServiceWorkerCache::Put callbacks.

The Put callback functions took an absurd number of paramters.  This
CL simplifies by putting them in a context struct.  This is needed by
a downstream CL that needs to add another member to the struct.

Upstream of: https://codereview.chromium.org/608593003

BUG=392621

Review URL: https://codereview.chromium.org/606843002

Cr-Commit-Position: refs/heads/master@{#297164}