Update web tests

Removed TestFeatures.

This class tested whether c2sc, smcp and unic OT features worked. Since the
fonts have been subset, the post table has been set to version 3. This has
an effect on the glyph names.
https://www.microsoft.com/typography/otspec/post.htm

By changing the table to v3, the test failed because they relied on glyph
names stored in txt files, res/c2sc_requirements.txt...

The webfonts are derived from the out/RobotoCondensedTTF binaries. These
binaries have already had these OT features tested in
scripts/run_general_tests.py.

scripts/run_web_tests.py

@@ -102,10 +102,6 @@ class TestLigatures(run_general_tests.TestLigatures):
     loaded_fonts = FONTS
 
 
-class TestFeatures(run_general_tests.TestFeatures):
-    loaded_fonts = FONTS
-
-
 class TestGlyphBounds(run_general_tests.TestGlyphBounds):
     loaded_fonts = FONTS