[ios] Don't rely on nil webState in LocationBarCoordinator.

Bug: 934294
Change-Id: I3737b1560f138250206f9f1b8648d32ada9f0392
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1520702
Reviewed-by: Rohit Rao <rohitrao@chromium.org>
Commit-Queue: Justin Cohen <justincohen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#641002}

ios/chrome/browser/ui/location_bar/location_bar_coordinator.mm

@@ -270,10 +270,12 @@ const int kLocationAuthorizationStatusCount = 4;
 - (void)focusOmniboxFromSearchButton {
   // TODO(crbug.com/931284): Temporary workaround for intermediate broken state
   // in the NTP.  Remove this once crbug.com/899827 is fixed.
-  NewTabPageTabHelper* NTPHelper =
-      NewTabPageTabHelper::FromWebState(self.webState);
-  if (NTPHelper && NTPHelper->IsActive() && NTPHelper->IgnoreLoadRequests()) {
-    return;
+  if (self.webState) {
+    NewTabPageTabHelper* NTPHelper =
+        NewTabPageTabHelper::FromWebState(self.webState);
+    if (NTPHelper && NTPHelper->IsActive() && NTPHelper->IgnoreLoadRequests()) {
+      return;
+    }
   }
   [self.omniboxCoordinator setNextFocusSourceAsSearchButton];
   [self focusOmnibox];
@@ -286,10 +288,12 @@ const int kLocationAuthorizationStatusCount = 4;
 - (void)focusOmnibox {
   // TODO(crbug.com/931284): Temporary workaround for intermediate broken state
   // in the NTP.  Remove this once crbug.com/899827 is fixed.
-  NewTabPageTabHelper* NTPHelper =
-      NewTabPageTabHelper::FromWebState(self.webState);
-  if (NTPHelper && NTPHelper->IsActive() && NTPHelper->IgnoreLoadRequests()) {
-    return;
+  if (self.webState) {
+    NewTabPageTabHelper* NTPHelper =
+        NewTabPageTabHelper::FromWebState(self.webState);
+    if (NTPHelper && NTPHelper->IsActive() && NTPHelper->IgnoreLoadRequests()) {
+      return;
+    }
   }
   // Dismiss the edit menu.
   [[UIMenuController sharedMenuController] setMenuVisible:NO animated:NO];