Delete the extensions i18n message map cache when extension unload is received.
Invalidate the messages map for the extension in case the extension is reloaded
with a new messages map.
BUG=
53628
TEST=Load an unpacked extension with i18n messages used in a content script.
Open a window or tab that loads the i18n messages. Change the messages.json
file. Reload the extension and the messages should be changed.
Committed:
https://src.chromium.org/viewvc/chrome?view=rev&revision=188460