Polymer: Stop including test related components to production binary.

ui/webui/resources/polymer_resources.grdp

 <?xml version="1.0" encoding="utf-8"?>
 <!--
   This file is generated.
   Please use 'src/tools/polymer/polymer_grdp_to_txt.py' and
   'src/tools/polymer/txt_to_polymer_grdp.py' to modify it, if possible.
 
   'polymer_grdp_to_txt.py' converts 'polymer_resources.grdp' to a plain list of
   used Polymer components:
     ...
     iron-iron-iconset/iron-iconset-extracted.js
@@ skipping 260 matching lines @@
              type="chrome_html" />
   <structure name="IDR_POLYMER_1_0_IRON_SELECTOR_IRON_SELECTION_HTML"
              file="../../../third_party/polymer/v1_0/components-chromium/iron-selector/iron-selection.html"
              type="chrome_html" />
   <structure name="IDR_POLYMER_1_0_IRON_SELECTOR_IRON_SELECTOR_EXTRACTED_JS"
              file="../../../third_party/polymer/v1_0/components-chromium/iron-selector/iron-selector-extracted.js"
              type="chrome_html" />
   <structure name="IDR_POLYMER_1_0_IRON_SELECTOR_IRON_SELECTOR_HTML"
              file="../../../third_party/polymer/v1_0/components-chromium/iron-selector/iron-selector.html"
              type="chrome_html" />
-  <structure name="IDR_POLYMER_1_0_IRON_TEST_HELPERS_IRON_TEST_HELPERS_HTML"
-             file="../../../third_party/polymer/v1_0/components-chromium/iron-test-helpers/iron-test-helpers.html"
-             type="chrome_html" />
-  <structure name="IDR_POLYMER_1_0_IRON_TEST_HELPERS_MOCK_INTERACTIONS_HTML"
-             file="../../../third_party/polymer/v1_0/components-chromium/iron-test-helpers/mock-interactions.html"
-             type="chrome_html" />
-  <structure name="IDR_POLYMER_1_0_IRON_TEST_HELPERS_MOCK_INTERACTIONS_JS"
-             file="../../../third_party/polymer/v1_0/components-chromium/iron-test-helpers/mock-interactions.js"
-             type="chrome_html" />
-  <structure name="IDR_POLYMER_1_0_IRON_TEST_HELPERS_TEST_HELPERS_HTML"
-             file="../../../third_party/polymer/v1_0/components-chromium/iron-test-helpers/test-helpers.html"
-             type="chrome_html" />
-  <structure name="IDR_POLYMER_1_0_IRON_TEST_HELPERS_TEST_HELPERS_JS"
-             file="../../../third_party/polymer/v1_0/components-chromium/iron-test-helpers/test-helpers.js"
-             type="chrome_html" />
   <structure name="IDR_POLYMER_1_0_IRON_VALIDATABLE_BEHAVIOR_IRON_VALIDATABLE_BEHAVIOR_EXTRACTED_JS"
              file="../../../third_party/polymer/v1_0/components-chromium/iron-validatable-behavior/iron-validatable-behavior-extracted.js"
              type="chrome_html" />
   <structure name="IDR_POLYMER_1_0_IRON_VALIDATABLE_BEHAVIOR_IRON_VALIDATABLE_BEHAVIOR_HTML"
              file="../../../third_party/polymer/v1_0/components-chromium/iron-validatable-behavior/iron-validatable-behavior.html"
              type="chrome_html" />
   <structure name="IDR_POLYMER_1_0_NEON_ANIMATION_ANIMATIONS_FADE_IN_ANIMATION_EXTRACTED_JS"
              file="../../../third_party/polymer/v1_0/components-chromium/neon-animation/animations/fade-in-animation-extracted.js"
              type="chrome_html" />
   <structure name="IDR_POLYMER_1_0_NEON_ANIMATION_ANIMATIONS_FADE_IN_ANIMATION_HTML"
@@ skipping 450 matching lines @@
              file="../../../third_party/polymer/v1_0/components-chromium/polymer/polymer-mini.html"
              type="chrome_html" />
   <structure name="IDR_POLYMER_1_0_POLYMER_POLYMER_HTML"
              file="../../../third_party/polymer/v1_0/components-chromium/polymer/polymer.html"
              type="chrome_html" />
   <structure name="IDR_POLYMER_1_0_WEB_ANIMATIONS_JS_WEB_ANIMATIONS_NEXT_LITE_MIN_JS"
              file="../../../third_party/web-animations-js/sources/web-animations-next-lite.min.js"
              type="chrome_html" />
 </grit-part>