Check fieldTrialValues type in Search widget extension

Bug: 994775
Change-Id: I9156b827969930dfb0f98b1f24edc1247024ecb2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1789309Reviewed-by: Robbie Gibson <rkgibson@google.com>
Commit-Queue: Olivier Robin <olivierrobin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#694227}

ios/chrome/search_widget_extension/search_widget_view_controller.mm

@@ -287,8 +287,10 @@
 
 - (BOOL)copiedContentBehaviorEnabled {
   NSDictionary* storedData = self.fieldTrialValues[@"CopiedContentBehavior"];
-  if (![kCopiedContentBehaviorVersion
-          isEqualToNumber:storedData[kFieldTrialVersionKey]]) {
+  NSNumber* storedVersion =
+      base::mac::ObjCCast<NSNumber>(storedData[kFieldTrialVersionKey]);
+  if (!storedVersion ||
+      ![kCopiedContentBehaviorVersion isEqualToNumber:storedVersion]) {
     return NO;
   }