Remove whitespace in the <ping> element closing tag in the comp updater.

components/update_client/update_checker.cc

Index: components/update_client/update_checker.cc
diff --git a/components/update_client/update_checker.cc b/components/update_client/update_checker.cc
index c1cf4d7fce8dded3a25452e2829cc1cfbbadefeb..35e178734ed26548dadb3a5b3f7fad9b018c365e 100644
--- a/components/update_client/update_checker.cc
+++ b/components/update_client/update_checker.cc
@@ -64,9 +64,9 @@ bool IsEncryptionRequired(const std::vector<CrxUpdateItem*>& items) {
 // An app element looks like this:
 //    <app appid="hnimpnehoodheedghdeeijklkeaacbdc"
 //         version="0.1.2.3" installsource="ondemand">
-//      <updatecheck />
+//      <updatecheck/>
 //      <packages>
-//        <package fp="abcd" />
+//        <package fp="abcd"/>
 //      </packages>
 //    </app>
 std::string BuildUpdateCheckRequest(const Configurator& config,
@@ -109,7 +109,7 @@ std::string BuildUpdateCheckRequest(const Configurator& config,
     }
     base::StringAppendF(&app, "/>");
 
-    base::StringAppendF(&app, "<ping rd=\"%d\" ping_freshness=\"%s\" />",
+    base::StringAppendF(&app, "<ping rd=\"%d\" ping_freshness=\"%s\"/>",
                         metadata->GetDateLastRollCall(item->id),
                         metadata->GetPingFreshness(item->id).c_str());
     if (!item->component.fingerprint.empty()) {