Remove use of set_sources_assignment_filter The sources assignment filter is considered a misfeature of gn and is planned for removal (see discussion at [1]). Convert dart BUILD.gn rules to manually filter the files that are build using explicit `if` expressions. Remove obsolete call to set_sources_assignment_filter() to filter '*_test.*' files as no such files are present in the variables used to build the `sources` value. [1]: https://groups.google.com/a/chromium.org/g/gn-dev/c/oQcYStl_WkI/m/roukYTxSDAAJ Bug: gn:125 Change-Id: I591fbb746cf694f7d2a5a330f81652380acf5c11 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/166629 Reviewed-by: Ryan Macnak <rmacnak@google.com>
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