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- Added final Copy Link URL icon,
- Fixed the string for Copy Link URL action,
- Fixed the string used for Open in New Window action title (it should
  not have a capital 'i'),
- Fixed new menu's Open in Incognito string.

This CL adds the first icon (copy_link_url) for the new actions. If the
proposed pattern is acceptable then the remaining icons will follow a
similar pattern.
- Icon resource under ui/menu/,
- No "menu" prefix to the icon name,
- PNGs with different scales used instead of PDF,
- Template icon, to allow menus to set the color.

Bug: 1093302
Change-Id: Ie22d50d78a4d38c56f9c04cfc2c9cbb66d83ef0f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2343320
Commit-Queue: Sebastien Lalancette <seblalancette@chromium.org>
Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Cr-Commit-Position: refs/heads/master@{#796408}