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This CL is a part of the efforts to create multipaste menu items
for copied files. This CL does the following jobs:

(1) Create a new type for `ClipboardHistoryDisplayFormat` called `kFile`.

(2) Move the code related to the text label out of ClipboardHistoryText-
ItemView. Instead, create `ClipboardHistoryLabel` for the text label
used by the multipaste menu.

Right now a `ClipboardHistoryTextItemView` instance is built for a
clipboard data whose display format is `kFile`. So this CL does not
introduce any visual difference.

Bug: 1134392
Change-Id: I7fb4b9ce5d37fcd298b5cfefcd9dcee0ad160c26
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2547225
Commit-Queue: Andrew Xu <andrewxu@chromium.org>
Reviewed-by: David Black <dmblack@google.com>
Cr-Commit-Position: refs/heads/master@{#829854}