Update histograms for recently added UseFeatures.

BUG=82522

Review URL: https://codereview.chromium.org/363453002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@280893 0039d316-1c4b-4281-b951-d872f2087c98

tools/metrics/histograms/histograms.xml

@@ -39005,6 +39005,11 @@ Therefore, the affected-histogram name has to have at least one dot in it.
   <int value="469" label="CSSSelectorPseudoHost"/>
   <int value="470" label="CSSSelectorPseudoHostContext"/>
   <int value="471" label="CSSDeepCombinator"/>
+  <int value="472" label="SyncXHRWithCredentials"/>
+  <int value="473" label="UseAsm"/>
+  <int value="474" label="KeyEventNotAllowedInFullScreen"/>
+  <int value="475" label="DOMWindowOpen"/>
+  <int value="476" label="DOMWindowOpenFeatures"/>
 </enum>
 
 <enum name="FFmpegCodecs" type="int">