fixed codereview notice

android/java/org/chromium/chrome/browser/tabbed_mode/BraveTabbedNavigationBarColorControllerBase.java

@@ -9,6 +9,7 @@
 import android.os.Build;
 
 import androidx.annotation.ColorInt;
+import androidx.annotation.Nullable;
 import androidx.annotation.RequiresApi;
 
 import org.chromium.base.BraveReflectionUtil;
@@ -24,9 +25,9 @@ class BraveTabbedNavigationBarColorControllerBase {
      * This variable will be used instead of `TabGroupModelFilter#mContext`, that will be deleted in
      * bytecode.
      */
-    protected Context mContext;
+    protected @Nullable Context mContext;
 
-    protected TabModelSelector mTabModelSelector;
+    protected @Nullable TabModelSelector mTabModelSelector;
 
     // Calls from the upstream's private function
     // `TabbedNavigationBarColorController#getNavigationBarColor`
@@ -37,7 +38,7 @@ public int getNavigationBarColor(boolean forceDarkNavigationBar) {
         if (BottomToolbarConfiguration.isBottomToolbarEnabled()
                 && BraveMenuButtonCoordinator.isMenuFromBottom()
                 && mContext != null) {
-            if (mTabModelSelector.isIncognitoSelected()) {
+            if (mTabModelSelector != null && mTabModelSelector.isIncognitoSelected()) {
                 return mContext.getColor(R.color.toolbar_background_primary_dark);
             } else {
                 return mContext.getColor(R.color.default_bg_color_baseline);