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As advised in [1], this CL removes unnecessary Foo::Create() factory functions
which return an instance created by MakeGarbageCollected<Foo> in
//third_party/blink/renderer/modules/webdatabase, then this CL makes
the callers use MakeGarbageCollected<Foo> instead of Foo::Create() factory
functions.

[1] https://groups.google.com/a/chromium.org/forum/#!msg/blink-dev/iJ1bawbxbWs/vEdfT5QtBgAJ

Bug: 939691
Change-Id: Ic675c3325b66468b4686f69e0f950cc8d99034b2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1556964Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Gyuyoung Kim <gyuyoung@igalia.com>
Cr-Commit-Position: refs/heads/master@{#648656}