Replace SkDeque with std::deque in SkiaCanvas

SkDeque is private to Skia and the std library one should be
sufficient.

This change was started by kjlubick@ and continued by nscobie@.

Test: existing presubmits (functionality unchanged)
Change-Id: I60751aa77337c1601428d00d3ba4bc4b8ccb67a9
2 files changed