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The ICU 54.1 upgrade added a call to uloc_getDefault() to
base/test/test_suite.cc, but did not add a libicuuc dependency
to the corresponding gyp/gn targets.  This makes it possible to
mix system and bundled ICU headers (and will fail to build if
they differ in version).

BUG=428145

Review URL: https://codereview.chromium.org/943233002

Cr-Commit-Position: refs/heads/master@{#317616}