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AppCacheURLLoaderJob is the only subclass of AppCacheJob. This is a
vestige of the Network Service migration, which introduced the
AppCacheJob base class with two implementations.

This CL merges AppCacheJob and AppCacheURLLoaderJob, and renames the
result to AppCacheURLLoader. The new name is more appropriate in a
Network Service-only world, and removes the potential for confusion
with AppCacheUpdateJob.

The following replaces were done mechanically over the entire
repository:
* AppCacheURLLoaderJob -> AppCacheURLLoader
* AppCacheJob -> AppCacheURLLoader
* appcache_url_loader_job.h -> appcache_url_loader.h
* appcache_job.h -> appcache_url_loader.h
* GetDerivedWeakPtr -> GetWeakPtr
* appcache_url_loader_job -> appcache_url_loader

AppCacheJob::AsURLLoaderJob() was removed, as it became a no-op after
the class merger. The mechanical replaces above removed
AppCacheURLLoaderJob::GetDerivedWeakPtr(), which became a synonym for
GetWeakPtr().

When relevant, job / Job was replaced with loader / Loader in local
variable names and method names.

This CL does not introduce any functional change.

Change-Id: I5a508a8dcb14ec77da05dd345d280ea27fa12fa5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2066298
Commit-Queue: Victor Costan <pwnall@chromium.org>
Reviewed-by: Joshua Bell <jsbell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#743485}