Correct values of UMA Enterprise.DevicePolicyInvalidations

Enterprise.DevicePolicyInvalidations can take the values [0, 1, 3, 4],
not [0, 1, 2, 3] as erroneously specified in histograms.xml.

BUG=None
TEST=None

Review URL: https://codereview.chromium.org/1067323002

Cr-Commit-Position: refs/heads/master@{#324408}

tools/metrics/histograms/histograms.xml

@@ -48996,8 +48996,8 @@ Therefore, the affected-histogram name has to have at least one dot in it.
   </summary>
   <int value="0" label="No payload; not expired"/>
   <int value="1" label="Payload; not expired"/>
-  <int value="2" label="No payload; expired"/>
-  <int value="3" label="Payload; expired"/>
+  <int value="3" label="No payload; expired"/>
+  <int value="4" label="Payload; expired"/>
 </enum>
 
 <enum name="EnterprisePolicyLoadStatus" type="int">