Expose UseCounter::Feature enum out of blink as WebFeature

tools/metrics/histograms/update_use_counter_feature_enum.py

Index: tools/metrics/histograms/update_use_counter_feature_enum.py
diff --git a/tools/metrics/histograms/update_use_counter_feature_enum.py b/tools/metrics/histograms/update_use_counter_feature_enum.py
index a0bf042d12faaf20113db52c21f792b80ddd03fe..e26c2695af4b4b6f6090097a4180fcfa99ea2ae9 100755
--- a/tools/metrics/histograms/update_use_counter_feature_enum.py
+++ b/tools/metrics/histograms/update_use_counter_feature_enum.py
@@ -32,9 +32,9 @@ if __name__ == '__main__':
                     'https://github.com/GoogleChrome/chromium-dashboard')
   options, args = parser.parse_args()
 
-  source_path = 'third_party/WebKit/Source/core/frame/UseCounter.h'
+  source_path = 'third_party/WebKit/public/platform/WebFeature.h'
 
-  START_MARKER = '^enum Feature : uint32_t {'
+  START_MARKER = '^enum class WebFeature : uint32_t {'
   END_MARKER = '^kNumberOfFeatures'
 
   if options.dashboard: