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As opposed to WebKit/public/mojom:mojom_platform, the gn target
WebKit/public/mojom:mojom includes mojom interfaces which do use types
that are typemapped to a type in Source/core, and its C++ bindings for
Blink variant is embedded inside blink_core component.

So, to avoid any confusion, this CL renames it to
WebKit/public/mojom:mojom_core to announce explicitly the close
relationship with Source/core.

BUG=

Change-Id: I3a9e68e8f7da5bf0c085d11e9a8cbd273247c638
Reviewed-on: https://chromium-review.googlesource.com/952113Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Commit-Queue: Han Leon <leon.han@intel.com>
Cr-Commit-Position: refs/heads/master@{#541685}