[Mac] Update location bar colors when change themes in Material Design.

chrome/browser/ui/cocoa/location_bar/location_bar_view_mac.mm

Index: chrome/browser/ui/cocoa/location_bar/location_bar_view_mac.mm
diff --git a/chrome/browser/ui/cocoa/location_bar/location_bar_view_mac.mm b/chrome/browser/ui/cocoa/location_bar/location_bar_view_mac.mm
index bc3aeeb1ac6fd54b01e7299f60967eb0e28d6767..22d28186f262b1e28fc14d42ed9b9de3cf6fb527 100644
--- a/chrome/browser/ui/cocoa/location_bar/location_bar_view_mac.mm
+++ b/chrome/browser/ui/cocoa/location_bar/location_bar_view_mac.mm
@@ -585,18 +585,31 @@ void LocationBarViewMac::UpdateLocationIcon() {
   Layout();
 }
 
-void LocationBarViewMac::OnAddedToWindow() {
-  if (!ui::MaterialDesignController::IsModeMaterial()) {
+void LocationBarViewMac::UpdateColorsToMatchTheme() {
+  if (!ui::MaterialDesignController::IsModeMaterial() ||
+      ![[field_ window] inIncognitoMode]) {
     return;
   }
 
   // Update the location-bar icon.
   UpdateLocationIcon();
 
-  // Make sure we're displaying the correct star color for a dark location bar.
-  if ([[field_ window] inIncognitoModeWithSystemTheme]) {
-    star_decoration_->SetStarred(star_decoration_->starred(), true);
-  }
+  // Make sure we're displaying the correct star color for Incognito mode. If
+  // the window is in Incognito mode, switching between a theme and no theme
+  // can move the window in and out of dark mode.
+  bool inDarkMode = [[field_ window] inIncognitoModeWithSystemTheme];
+  star_decoration_->SetStarred(star_decoration_->starred(), inDarkMode);
+
+  // Update the appearance of the text in the Omnibox.
+  omnibox_view_->Update();
+}
+
+void LocationBarViewMac::OnAddedToWindow() {
+  UpdateColorsToMatchTheme();
+}
+
+void LocationBarViewMac::OnThemeChanged() {
+  UpdateColorsToMatchTheme();
 }
 
 void LocationBarViewMac::OnChanged() {