Revert 237555 "Make RulesRegistry::process_changed_rules_request..."

> Make RulesRegistry::process_changed_rules_requested_ a map
> 
> process_changed_rules_requested_ stores the state of progress on writing a set of rules to the rules store.
> For each extension there are separate write tasks. Currently, process_changed_rules_requested_ is share among
> all such writes, which is wrong.
> 
> This CL makes process_changed_rules_requested_ a map from extension IDs to the state flags.
> 
> BUG=320645
> 
> Review URL: https://codereview.chromium.org/79433002

TBR=vabr@chromium.org

Review URL: https://codereview.chromium.org/90993005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@237569 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 237569