Originated in  issue 584920 , when use_system_icu=1 is set in GYP_DEFINES, USING_SYSTEM_ICU defined in config.gyp (added in CL[1]) works for wtf.gyp but not for blink_platform.gyp.

Note, use_system_icu=1 does not seem to work when it's used alone, that makes debugging a bit harder. Distributors using "unbundle"[2] and with several other variables hit this issue. See  issue 584920  for other variables to repro.

Currently a workaround[3] is in progress, but it is not a real fix.

[1] https://codereview.chromium.org/1167523003
[2] https://code.google.com/p/chromium/codesearch#chromium/src/build/linux/unbundle/README&q=unbundle&sq=package:chromium&type=cs&l=43
[3] https://codereview.chromium.org/1754603002