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This is a mock for ComponentExtensionIMEManagerDelegate interface, so
had better be named after it with just a prefix "Mock" added, for some
little consistency that would facilitate code browsing and readability.

It's not quite worth it to shorten "Extension" to "Ext" for small length
savings on a test-only thing, while adversely impacting consistency.
It's out of scope here to make conciseness improvement to the existing
naming scheme of this whole family of interfaces and classes.

The rename here also makes it precisely consistent with the names of .h
and .cc files where the Mock is declared and defined.

Bug: 1134465
Change-Id: Ie8ed0d1ee39813ae722e677c4a58628a8e49d52b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2442649
Auto-Submit: Bao-Duy Tran <tranbaoduy@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Reviewed-by: Keith Lee <keithlee@chromium.org>
Commit-Queue: Bao-Duy Tran <tranbaoduy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#817272}