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This CL migrates ExtensionMsg_Unloaded to extensions.mojom.Renderer
interface. Additionally, this CL renames the name of the parameter
from |id| to |extension_id| to be aligned with other functions.

Bug: 1146099
Change-Id: I9c5463a6331ed4a87e39996f72dabb4b0ac40931
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2536669Reviewed-by: Dave Tapuska <dtapuska@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Karan Bhatia <karandeepb@chromium.org>
Commit-Queue: Gyuyoung Kim <gyuyoung@igalia.com>
Cr-Commit-Position: refs/heads/master@{#828567}