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Now that we have blink::SurroundingText inside Blink and implemented
using internal Blink types like WTF::String and LocalFrame, we can
finally migrate blink::SurroundingTextImpl away from WebLocalFrame
and remove the DEPS exception rule we previously introduced during
this process of Onion Soup'ing the SurroundingText API.

Additionally, we move the instantiation of blink::SurroundingTextImpl
from WebLocalFrame to LocalFrame as well and, with that, we remove any
reference to public Blink classes from SurroundingText-related code.

Bug: 980151
Change-Id: I1a1014dbf6671b9327a068ceca4f62d873cb5fb3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1698413
Commit-Queue: Mario Sanchez Prada <mario@igalia.com>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#680346}