No longer display background page badge on initial start after upgrade

chrome/browser/background_page_tracker.cc

Index: chrome/browser/background_page_tracker.cc
diff --git a/chrome/browser/background_page_tracker.cc b/chrome/browser/background_page_tracker.cc
index 76cc63af38147985639959850756733295c7f6c3..1337d908d21263f0d594577fbcedb96a0ab3a8cc 100644
--- a/chrome/browser/background_page_tracker.cc
+++ b/chrome/browser/background_page_tracker.cc
@@ -190,6 +190,10 @@ bool BackgroundPageTracker::UpdateExtensionList() {
   PrefService* prefs = GetPrefService();
   std::set<std::string> keys_to_delete;
   bool pref_modified = false;
+  // If we've never set any prefs, then this is the first launch ever, so we
+  // want to automatically mark all existing extensions as acknowledged.
+  bool first_launch =
+      prefs->GetDictionary(prefs::kKnownBackgroundPages) == NULL;
   DictionaryValue* contents =
       prefs->GetMutableDictionary(prefs::kKnownBackgroundPages);
   for (DictionaryValue::key_iterator it = contents->begin_keys();
@@ -221,7 +225,7 @@ bool BackgroundPageTracker::UpdateExtensionList() {
       // If we have not seen this extension ID before, add it to our list.
       if (!contents->HasKey((*iter)->id())) {
         contents->SetWithoutPathExpansion(
-            (*iter)->id(), Value::CreateBooleanValue(false));
+            (*iter)->id(), Value::CreateBooleanValue(first_launch));
         pref_modified = true;
       }
     }
@@ -240,7 +244,7 @@ bool BackgroundPageTracker::UpdateExtensionList() {
          background_contents_service->GetParentApplicationId(*iter));
      if (!contents->HasKey(application_id)) {
         contents->SetWithoutPathExpansion(
-            application_id, Value::CreateBooleanValue(false));
+            application_id, Value::CreateBooleanValue(first_launch));
         pref_modified = true;
      }
   }