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This CL cleans up the unused OnDidGetPrintedPagesCount which was
a handler for PrintHostMsg_DidGetPrintedPagesCount from
PrintMockRenderThread. The PrintHostMsg_DidGetPrintedPagesCount
message has been converted to Mojo [1] and the handler is not used
anymore.

[1] https://crrev.com/c/2326857

Bug: 1008939
Change-Id: Ifec8922958de92d544444d63198f22987a931aac
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2362070Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Julie Kim <jkim@igalia.com>
Cr-Commit-Position: refs/heads/master@{#799555}