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This CL addresses a TODO from
chrome/renderer/chrome_render_view_observer.cc to associate
ChromeViewMsg_GetWebApplicationInfo and
ChromeViewHostMsg_DidGetWebApplicationInfo IPCs with frame, rather than
view.

This CL helps ensure that
ChromeRenderFrameObserver::OnGetWebApplicationInfo (formerly a method of
ChromeRender*View*Observer) always operates on a local frame (and
therefore this CL helps with moving GetDocument method from WebFrame to
WebLocalFrame in a follow-up CL - https://crrev.com/2928033002).

BUG=416660

Review-Url: https://codereview.chromium.org/2942583004
Cr-Commit-Position: refs/heads/master@{#481026}