Disable FontSrcLocalMatching on Windows

The Windows 7 bot does currently not efficiently cache the font lookup
table for layout tests because a cache directory is not
configured. Also, Win7 layout tests failed with DCHECKs when a path was
not configured. Disable FontSrcLocalMatching on Windows until this is
properly addressed.

Bug: 996027, 996167
Change-Id: Iaa21ab1a32cda73d8f7e3a2e6bd803c132105781
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1778491Reviewed-by: Ken Rockot <rockot@google.com>
Reviewed-by: Avi Drissman <avi@chromium.org>
Auto-Submit: Dominik Röttsches <drott@chromium.org>
Commit-Queue: Dominik Röttsches <drott@chromium.org>
Cr-Commit-Position: refs/heads/master@{#692192}

content/public/common/content_features.cc

@@ -148,8 +148,15 @@ const base::Feature kFeaturePolicyForSandbox{"FeaturePolicyForSandbox",
 // Enables fixes for matching src: local() for web fonts correctly against full
 // font name or postscript name. Rolling out behind a flag, as enabling this
 // enables a font indexer on Android which we need to test in the field first.
+// TODO(https://crbug.com/996027): Re-enable this on Windows once Windows 7
+// DWRiteFontLookupTableBuilder stability is fixed.
+#if !defined(OS_WIN)
 const base::Feature kFontSrcLocalMatching{"FontSrcLocalMatching",
                                           base::FEATURE_ENABLED_BY_DEFAULT};
+#else
+const base::Feature kFontSrcLocalMatching{"FontSrcLocalMatching",
+                                          base::FEATURE_DISABLED_BY_DEFAULT};
+#endif
 
 // Enables scrollers inside Blink to store scroll offsets in fractional
 // floating-point numbers rather than truncating to integers.