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This is a refactoring CL as a preparation to fix focus handling on
Win-Aura environment. This CL does not change any behavior of
production binaries.

Currently InputMethodBridgeUnitTest internally defines a custom
dummy class of ui::InputMethod. However this is not necessary
because we already have ui::FakeInputMethod.

This CL replaces the custom dummy class with
ui::FakeInputMethod by using DummyInputMethodDelegate.
We can reuse ui::DummyInputMethodDelegate later in other
unit tests.

BUG=287620
TEST=unit test

Review URL: https://chromiumcodereview.appspot.com/23875014

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@222255 0039d316-1c4b-4281-b951-d872f2087c98