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As a step to remove Create() factory functions, this CL converts
<{{cpp_class}}>::Create() to MakeGarbageCollected<{{cpp_class}}>.

As this CL modifies the template file, dependent tests are modified
by the change.

Bug: 939691
Change-Id: I9546faf3e5c43b583d2f4694a75f5cbd70e4d10a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1946048Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Gyuyoung Kim <gyuyoung@igalia.com>
Cr-Commit-Position: refs/heads/master@{#720411}