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This change updates the version of axe-core to the latest released
version. As part of picking up the latest version, the following
additional changes were made:

1) axe-core removed the 'href-no-hash' rule, so that been removed
   from the test list.

2) Several 'link-in-text-block' tests started failing with
   axe-core v3.0.2 (and later). These tests do pass in v3.0.1, but
   are disabled as part of this change.
     - CrManagementA11yTest.SimpleTest_link_in_text_block
     - CrManagementA11yTestWithExtension.
                                ExtensionSection_link_in_text_block
     - CrostiniAccessibilityTest.CROSTINI_link_in_text_block
     - CrExtensionsA11yTest.NoExtensions_link_in_text_block
     - MultideviceA11yTest.MULTIDEVICE_link_in_text_block
     - MultideviceFeaturesA11yTest.
              MULTIDEVICE_FEATURES_ACCESSIBILITY_link_in_text_block

3) One 'heading-order' test started failing in v3.0.0 (and later).
   This tests does pass in V2.4.2, but is disabled as part of this
   change.
     - CrExtensionsA11yTestWithMultipleExensions.
                                       WithExtensions_heading_order

4) One color-contrast test started failing. This test has been disabled
   since there other tests also disabled for this rule
     - WelcomeA11y.WelcomeFlow_color_contrast

5) Several DevTools a11y tests were failing. This change either
   updates the baseline or excludes the rule depending upon the
   test/rule itself.
     - http/tests/devtools/a11y-axe-core/basic-a11y-test.js
     - http/tests/devtools/a11y-axe-core/console-a11y-test.js
     - http/tests/devtools/a11y-axe-core/memory/heap-profiler-a11y-test.js
     - http/tests/devtools/a11y-axe-core/performance/performance-pane-a11y-test.js
     - http/tests/devtools/a11y-axe-core/sources/dom-breakpoints-pane-a11y-test.js

I spent some time investigating the test failures, and it looks
like axe-core is highlighting legitimate product issues.

Bug: 984817
Change-Id: I245af601c4f086d96768fa5677e253095fc53087
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1841834
Commit-Queue: Mike Jackson <mjackson@microsoft.com>
Reviewed-by: Yang Guo <yangguo@chromium.org>
Reviewed-by: Lorne Mitchell <lomitch@microsoft.com>
Reviewed-by: Hector Carmona <hcarmona@chromium.org>
Cr-Commit-Position: refs/heads/master@{#704624}