Sort histogram definitions alphabetically.

tools/metrics/histograms/histograms.xml

Index: tools/metrics/histograms/histograms.xml
diff --git a/tools/metrics/histograms/histograms.xml b/tools/metrics/histograms/histograms.xml
index 41b6b4868001e88d283c03c2a4649ac7607727e1..e7c17cf5083e21237820f2d3c73b7a029dd5631f 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -9379,6 +9379,15 @@ other types of suffix sets.
   </summary>
 </histogram>
 
+<histogram name="Translate.LocalesOnDisabledByPrefs" enum="LanguageCode">
+  <summary>
+    Logs the user locale when the Translate feature is disabled by the user.
+    This is recorded each time a webpage is loaded and prefs for translation is
+    checked. This allows us to investigate the correlation between the user
+    locale and the usage rates of the Translate.
+  </summary>
+</histogram>
+
 <histogram name="Translate.ModifyOriginalLang">
   <summary>
     The number of times the original language in the translate infobar has been
@@ -9407,15 +9416,6 @@ other types of suffix sets.
   </summary>
 </histogram>
 
-<histogram name="Translate.LocalesOnDisabledByPrefs" enum="LanguageCode">
-  <summary>
-    Logs the user locale when the Translate feature is disabled by the user.
-    This is recorded each time a webpage is loaded and prefs for translation is
-    checked. This allows us to investigate the correlation between the user
-    locale and the usage rates of the Translate.
-  </summary>
-</histogram>
-
 <histogram name="Translate.PageScheme" enum="TranslateScheme">
   <summary>Counts translation target page schemes.</summary>
 </histogram>