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ContextMenuDelegate talks in RVCMBase. This is fine for
ContextMenuDelegate::BuildMenu, but while showing it through
ContextMenuDelegate::ShowMenu, each platform downcasts the
RVCMBase to its own variant (RVCMViews, RVCMMac, RVCMImpl),
this seems unnecessary since the showing functionality can be
moved to RVContextMenuBase.
This CL does that and adds a virtual Show() function on
RVCMBase.

BUG=397364
Test=No visible change should occur.
For reference, this CL is related to brining up right-click context menus
in chrome.

Review URL: https://codereview.chromium.org/678653003

Cr-Commit-Position: refs/heads/master@{#301564}