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Cleanup: Modernizes some parts of CrossPlatformAccessibilityBrowserTest,...

Cleanup: Modernizes some parts of CrossPlatformAccessibilityBrowserTest, enables all disabled tests and makes them more consistent with other accessibility browser tests

Some tests having to do with iframe traversal in CrossPlatformAccessibilityBrowserTest were disabled.
In https://crrev.com/c/2556452, the kPDFRoot role is being added and the kWebArea role is being removed.
Iframe traversal tests should be enabled and functioning to ensure the robustness of any code changes
in those roles, as they could potentially break iframe navigation.

Meanwhile, many of the code convensions used in CrossPlatformAccessibilityBrowserTest were different from all other accessibility browser tests
and some have been superceded by changes to C++.

This patch switches to using raw literal strings for loading HTML snippets, improves indentation, and
uses the same method names for loading test pages as in other accessibility browser tests.
Also, useless comments were eliminated and test fixtures cleaned up were necessary.

Originally split out from
https://crrev.com/c/2556452

AX-Relnotes: n/a.

R=dmazzoni@chromium.org, aleventhal@chromium.org

Change-Id: Ia9c3094606581468d7f1b5c8849bb44668b47de1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2575101
Commit-Queue: Nektarios Paisios <nektar@chromium.org>
Auto-Submit: Nektarios Paisios <nektar@chromium.org>
Reviewed-by: Abigail Klein <abigailbklein@google.com>
Cr-Commit-Position: refs/heads/master@{#836225}