UMA: Update enums.xml.

A recent change for intrinsic-size forgot to update the enums.xml file.
(crrev.com/ae891958)

This patch updates said file.

R=chrishtr@chromium.org

Change-Id: I332d69cfdf1974e709bf6c9d3c14a998c51c38f0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1904498
Auto-Submit: vmpstr <vmpstr@chromium.org>
Commit-Queue: Chris Harrelson <chrishtr@chromium.org>
Reviewed-by: Chris Harrelson <chrishtr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#713669}

tools/metrics/histograms/enums.xml

@@ -40264,6 +40264,11 @@ Called by update_use_counter_css.py.-->
   <int value="645" label="overscroll-behavior-block"/>
   <int value="646" label="content-size"/>
   <int value="647" label="font-optical-sizing"/>
+  <int value="648" label="intrinsic-block-size"/>
+  <int value="649" label="intrinsic-height"/>
+  <int value="650" label="intrinsic-inline-size"/>
+  <int value="651" label="intrinsic-size"/>
+  <int value="652" label="intrinsic-width"/>
 </enum>
 
 <enum name="MappedEditingCommands">