Fix GN build on mac with icu_use_data_file = false

Several BUILD.gn files were bundling icudtl.dat even when
icu_use_data_file = false (i.e. icudata is statically linked).

The TEST below was done with https://codereview.chromium.org/2174993002/ on
the ICU side. This CL still can get in without that change, though.

BUG=630929
TEST='gn args <outdir>' with icu_use_data_file=false generates ninja files.
TEST=chrome / content_shell can be built.
TEST=In Chrome/content_shell, go to a non-UTF-8 page (www.hankyung.com) or
     run `(new Date()).toLocaleString("de")` to make sure that ICU data
     is accessible.

Review-Url: https://codereview.chromium.org/2181043003
Cr-Commit-Position: refs/heads/master@{#408866}
4 files changed