[ppapi] Renamed two global variables and types in ppapi/proxy

In jumbo build experiments, the different
InstanceToDispatcherMap types and g_instance_to_dispatcher
globals ended up in the same translation unit and thus the same
anonymous namespace where the symbols clashed. This just renames
them as Dispatcher -> PluginDispatcher/HostDispatcher.

Bug: 898475
Change-Id: Ieae4310fdbe7ea27954011964d2bb6fa4d83e338
Reviewed-on: https://chromium-review.googlesource.com/c/1297145
Reviewed-by: Antoine Labour <piman@chromium.org>
Commit-Queue: Daniel Bratell <bratell@opera.com>
Cr-Commit-Position: refs/heads/master@{#602647}
2 files changed