WebUI: Change tests to run with Polymer 1 for remaining migration

To ensure all automated tests are run with both configurations until
the migration is completed, change test suites to run with Polymer 1
instead of Polymer 2, now that Polymer 2 has been enabled by default
for all OSes.

Bug: 931434
Change-Id: I9a6cc87fdc4c761b35907fbe6ccdbc826ec45589
Reviewed-on: https://chromium-review.googlesource.com/c/1469297
Commit-Queue: Rebekah Potter <[email protected]>
Reviewed-by: Dirk Pranke <[email protected]>
Cr-Commit-Position: refs/heads/master@{#634331}
diff --git a/testing/buildbot/test_suite_exceptions.pyl b/testing/buildbot/test_suite_exceptions.pyl
index f1696c2..81be2431 100644
--- a/testing/buildbot/test_suite_exceptions.pyl
+++ b/testing/buildbot/test_suite_exceptions.pyl
@@ -1654,13 +1654,13 @@
       },
     },
   },
-  'webui_polymer2_browser_tests': {
+  'webui_polymer1_browser_tests': {
     'remove_from': [
       # chromium.win
       'Win10 Tests x64 (dbg)',  # Matches browser_tests.
     ],
   },
-  'webui_polymer2_interactive_ui_tests': {
+  'webui_polymer1_interactive_ui_tests': {
     'modifications': {
       # Match interactive_ui_tests, see https://crbug.com/840369
       # chromium.win