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This CL renames VideoCaptureHostTest to VideoCaptureTest, since it
really is an integration test of a bunch of classes, as detailed in
the class-comments.  I've tried a few times to disentangle this
mess, in which VideoCaptureHost references MediaStreamManager knowing
that the latter is a singleton; MediaStreamManager publicly allows
everyone to access its VideoCaptureManager; VideoCaptureManager
is a concrete class owning pairs of VideoCaptureController -
VideoCaptureDevice; and VideoCaptureController uses via naked pointer
VideoCaptureHosts.  Not worth it for this unit test.

BUG=651897

Review-Url: https://chromiumcodereview.appspot.com/2435393003
Cr-Commit-Position: refs/heads/master@{#427001}