Fix startup crash from security icon change for scheme hiding experiment.

BUG=837761

Change-Id: Ib256ba3133eae770167b5e06ae6c8ad9d0436658
Reviewed-on: https://chromium-review.googlesource.com/1033589Reviewed-by: Yusuf Ozuysal <yusufo@chromium.org>
Commit-Queue: Ted Choc <tedchoc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#554501}

chrome/android/java/src/org/chromium/chrome/browser/toolbar/ToolbarModel.java

@@ -395,7 +395,7 @@ public class ToolbarModel implements ToolbarDataProvider {
         if (isIncognito() || needLightIcon) {
             // For a dark theme color, use light icons.
             list = ApiCompatibilityUtils.getColorStateList(resources, R.color.light_mode_tint);
-        } else if (isUsingBrandColor()
+        } else if (!hasTab() || isUsingBrandColor()
                 || ChromeFeatureList.isEnabled(
                            ChromeFeatureList.OMNIBOX_HIDE_SCHEME_DOMAIN_IN_STEADY_STATE)) {
             // For theme colors which are not dark and are also not