Move constants from namespace to class (browser/ui)

When building using Jumbo unnamed namespaces gets merged
and variables with the same name conflict. This happens
for the variables kStartPadding and kEndPadding in
chrome/browser/ui/views/download/download_item_view.cc
and chrome/browser/ui/views/download/download_shelf_view.cc.

This commit solves the issue by moving the variables from
the namespace to the class. It also moves other variables
in the same namespace, to keep the files locally consistent.

Bug: 773275
Change-Id: I8d23ae9999fe404d253a3a189e6d17d81786939d
Reviewed-on: https://chromium-review.googlesource.com/1107063
Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
Reviewed-by: Bret Sepulveda <bsep@chromium.org>
Commit-Queue: Oscar Johansson <oscarj@opera.com>
Cr-Commit-Position: refs/heads/master@{#571901}
4 files changed