[MD History] Fix toolbar dates in grouped mode.

components/history_strings.grdp

Index: components/history_strings.grdp
diff --git a/components/history_strings.grdp b/components/history_strings.grdp
index 9dca85545db7a31eedd539c21b97b3a204106dc1..46504804b80a241cecf14b7726613cbd6789b370 100644
--- a/components/history_strings.grdp
+++ b/components/history_strings.grdp
@@ -58,9 +58,6 @@ Psst! Incognito mode <ph name="SHORTCUT_KEY">$1<ex>(Ctrl+Shift+N)</ex></ph> may
   <message name="IDS_HISTORY_OTHER_FORMS_OF_HISTORY" desc="The notification at the top of the history page indicating that deleting Chrome browsing history will not delete other forms of history stored at Google My Activity.">
     Your Google Account may have other forms of browsing history at <ph name="BEGIN_LINK">&lt;a target="_blank" href="$1"&gt;</ph>history.google.com<ph name="END_LINK">&lt;/a&gt;</ph>
   </message>
-  <message name="IDS_HISTORY_INTERVAL" desc="A history interval shown in the title. The dates are already localized strings.">
-    <ph name="START_DATE">$1<ex>Wednesday, Aug. 1, 2012</ex></ph> to <ph name="END_DATE">$2<ex>Thursday, Aug. 30, 2012</ex></ph>
-  </message>
   <message name="IDS_HISTORY_LOADING" desc="Text shown when we're loading the user's history">
     Loading...
   </message>