Fix crash during the loading with clean profile

To initialize initial prefs for dual DSE, it needs default TemplateUrl.
It can be fetched after TemplateUrlService loading is done.
So, initialization is done after loading is finished.

android/java/org/chromium/chrome/browser/preferences/BraveSearchEngineUtils.java

@@ -11,6 +11,7 @@ import org.chromium.base.ContextUtils;
 import org.chromium.base.Log;
 import org.chromium.chrome.browser.search_engines.TemplateUrlServiceFactory;
 import org.chromium.chrome.browser.tabmodel.TabModelSelector;
+import org.chromium.components.search_engines.TemplateUrlService;
 import org.chromium.components.search_engines.TemplateUrl;
 
 public class BraveSearchEngineUtils {
@@ -58,9 +59,21 @@ public class BraveSearchEngineUtils {
     static public void initializeBraveSearchEngineStates(TabModelSelector tabModelSelector) {
         tabModelSelector.addObserver(new SearchEngineTabModelSelectorObserver(tabModelSelector));
 
-        initializeDSEPrefs();
-        // Initially set standard dse as a active DSE.
-        updateActiveDSE(false);
+        // For first-run initialization, it needs default TemplateUrl.
+        // So, doing it after TemplateUrlService is loaded to get it if it isn't loaded yet.
+        if (TemplateUrlServiceFactory.get().isLoaded())  {
+            doInitializeBraveSearchEngineStates();
+            return;
+        }
+
+        TemplateUrlServiceFactory.get().registerLoadListener(
+            new TemplateUrlService.LoadListener() {
+                @Override
+                public void onTemplateUrlServiceLoaded() {
+                    TemplateUrlServiceFactory.get().unregisterLoadListener(this);
+                    doInitializeBraveSearchEngineStates();
+                }
+            });
     }
 
     static private void initializeDSEPrefs() {
@@ -80,4 +93,12 @@ public class BraveSearchEngineUtils {
             sharedPreferencesEditor.apply();
         }
     }
+
+    static private void doInitializeBraveSearchEngineStates() {
+        assert TemplateUrlServiceFactory.get().isLoaded();
+
+        initializeDSEPrefs();
+        // Initially set standard dse as an active DSE.
+        updateActiveDSE(false);
+    }
 }