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The status of the MathMLCore runtime flag is changed to "test" so that
that flag is used for running tests. A new section for MathML-related
expectation is introduced in TestExpectations. In addition to
expectations for new tests, the ones of MathML-related CSS tests are
moved there.

Blink currently contains an internal MathML-specific test
(mathml/fallback.html) which verifies fallback via the <semantics>
element when MathML is not implemented. This test will fail when more
MathML patches land but it is still important to ensure that test passes
when MathMLCore is disabled. A new virtual test suite is introduced for
that purpose and the test is moved there.

Expectation for http/tests/xmlviewer/dumpAsText/mathml.xml is also
updated since MathML is recognized as a known namespace when MathMLCore
is enabled.

Bug: 6606
Change-Id: Ia5a657e02850cad142d53a08baf10ec499467726
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1893878
Commit-Queue: Frédéric Wang <fwang@igalia.com>
Reviewed-by: Luke Z <lpz@chromium.org>
Reviewed-by: Manuel Rego <rego@igalia.com>
Cr-Commit-Position: refs/heads/master@{#713440}