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After https://crrev.com/c/1937958 was landed, on some build
configurations ImageProcessor became large enough for chromium style
checked to forbid inline destructor.

This commit moves destructor to image_processor.cc file, after that this
is no more issue for style checker.

Change-Id: I36efb3601fc9305ef61af1705618e6156528489a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1941313
Commit-Queue: Oleg Davydov <burunduk@chromium.org>
Commit-Queue: Hirokazu Honda <hiroh@chromium.org>
Auto-Submit: Oleg Davydov <burunduk@chromium.org>
Reviewed-by: Hirokazu Honda <hiroh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#719943}