[Dagger] Remove Dependency.get from VolumeDialogImpl.

The original change was reverted because it was breaking the build, but
that was because automerger split the topic so not all CLs were in the
build (see go/automerger-questions#did-automerger-split-a-topic). I'm
now submitting the same changes on master and sc-v2-dev to avoid
automerger issues.

Test: atest and manual
Bug: 138786270

Change-Id: I42665b800fb2016db9e33dcfa85c3661d9ccf605