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This is a simple refactoring that should have no side effects.

The change 'Use EmbeddingTokens as the "backing store" for AXTreeIDs'
(http://crrev.com/c/2270065) got rid of AXContentTreeUpdate, which was
previously a more complex version of AXTreeUpdate with some extra
content-specific fields.

There was a small missed opportunity to refactor here -
AXTreeSnapshotterImpl was serializing to a AXContentTreeUpdate and
then converting that to an AXTreeUpdate. Since AXContentTreeUpdate
no longer exists, the code to populate one struct and then copy it
to another one is redundant and can be simplified.

This shouldn't result in any change in functionality. AXTreeSnapshotter
is already covered by tests, primarily in
snapshot_ax_tree_browsertest.cc

Bug: 1094150, 1161541
AX-Relnotes: N/A
Change-Id: If9863ce23cca5538eeab5e0a34350d2f9bfe9e46
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2602438Reviewed-by: Mark Schillaci <mschillaci@google.com>
Commit-Queue: Dominic Mazzoni <dmazzoni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#839193}