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This patch removes [Native] and IPC_STRUCT for EmbeddedWorkerStartParams. In a
following patch, we can move all of params passed to
EmbeddedWorkerInstanceClient::StartWorker() to the
mojom::EmbeddedWorkerStartParams.
This patch is adding a typemap from content.mojom.EmbeddedWorkerStartParams to
content::EmbeddedWorkerStartParams in order to avoid fixing all users of the
params.

Bug: 776263
Change-Id: I7973e49be869b67e86e1a1b6cee7891b17c2f997
Reviewed-on: https://chromium-review.googlesource.com/784732Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Matt Falkenhagen <falken@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Commit-Queue: Makoto Shimazu <shimazu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#519584}