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The goal is to split up modules_idl_files.gni into smaller .gni files
that are owned by OWNERS of the corresponding module, so top-level
module OWNERS don't need to review every CL that adds a new IDL file.

This patch splits out the build files for IDLs that define
dictionaries.

Bug: 1048907
Change-Id: I1ec3d198ca89a02f69e088d7d739145da820f21e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2043770
Commit-Queue: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Auto-Submit: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#739373}