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This CL removes all compiled_resources2.gyp files from ui/webui and
third_party/polymer, and removes the script that generates them for
Polymer Elements.

TBR=jochen@chromium.org

Bug: 632206
Cq-Include-Trybots: luci.chromium.try:closure_compilation
Change-Id: I1866d4e682e41c462958ac1185b6cb7e70cb7130
Reviewed-on: https://chromium-review.googlesource.com/1105677
Commit-Queue: calamity <calamity@chromium.org>
Reviewed-by: calamity <calamity@chromium.org>
Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#568766}