[Dark] Don't use theme color on toolbar on dark mode

Bug: 958554
Change-Id: I7d8d78ed5b971d7d37630c93e320641b913d8e15
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1623537Reviewed-by: Theresa <twellington@chromium.org>
Commit-Queue: Becky Zhou <huayinz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#662656}

chrome/android/java/src/org/chromium/chrome/browser/tab/TabThemeColorHelper.java

@@ -113,6 +113,8 @@ public class TabThemeColorHelper extends EmptyTabObserver implements UserData {
         if (securityLevel == ConnectionSecurityLevel.DANGEROUS
                 || securityLevel == ConnectionSecurityLevel.SECURE_WITH_POLICY_INSTALLED_CERT
                 || (mTab.getActivity() != null && mTab.getActivity().isTablet())
+                || (mTab.getActivity() != null
+                        && mTab.getActivity().getNightModeStateProvider().isInNightMode())
                 || mTab.isNativePage() || mTab.isShowingInterstitialPage()
                 || themeColor == TabState.UNSPECIFIED_THEME_COLOR || mTab.isIncognito()
                 || mTab.isPreview()) {