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Starting with iOS 11, apps can ask for write-only access to photos. This
CL switches ImageSaver to use the new write-only API. It also removes
calls to the read-write PHPhotoLibrary APIs and removes code that checks
the photos authorization state, since there is no way to check the value
of the write-only permission in advance.

BUG=1102479

Change-Id: I245149c8480e9e02fa0c6218aa652bd26c9f7c5b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2283654
Commit-Queue: Rohit Rao <rohitrao@chromium.org>
Reviewed-by: Justin Cohen <justincohen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#785779}