Update proactive suggestions category enum.

Bug: None
Change-Id: I27b1d40f5bb74a5cda96aee5c468eb9404fdd8c0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2159567Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
Commit-Queue: David Black <dmblack@google.com>
Cr-Commit-Position: refs/heads/master@{#761078}

tools/metrics/histograms/enums.xml

@@ -54180,6 +54180,11 @@ Called by update_net_trust_anchors.py.-->
   <int value="0" label="kUnknown"/>
   <int value="1" label="kShopping"/>
   <int value="2" label="kNews"/>
+  <int value="3" label="kArtsAndEntertainment"/>
+  <int value="4" label="kHealth"/>
+  <int value="5" label="kJobsAndEducation"/>
+  <int value="6" label="kScience"/>
+  <int value="7" label="kTravel"/>
 </enum>
 
 <enum name="ProactiveSuggestionsRequestResult">