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As the comment in service_worker_navigation_handle.h, rename
ServiceWorkerNavigationHandle to ServiceWorkerMainResourceHandle.

This CL has no behavior changes.

Change-Id: I44ace8344e6feff740dc89517bafbb96d9c1b229
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1982513Reviewed-by: Matt Falkenhagen <falken@chromium.org>
Commit-Queue: Zhuoyu Qian <zhuoyu.qian@samsung.com>
Cr-Commit-Position: refs/heads/master@{#728460}