Removing iOS9 code remnants (16)

Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: Iacb8fa5fc1ddf0999a602c0509cc4fdd46b0a116
Reviewed-on: https://chromium-review.googlesource.com/986433
Reviewed-by: Olivier Robin <olivierrobin@chromium.org>
Commit-Queue: Eric Noyau <noyau@chromium.org>
Cr-Commit-Position: refs/heads/master@{#546826}

ios/chrome/search_widget_extension/search_widget_view_controller.mm

@@ -128,11 +128,8 @@ - (void)viewWillTransitionToSize:(CGSize)size
            (id<UIViewControllerTransitionCoordinator>)coordinator {
   [super viewWillTransitionToSize:size withTransitionCoordinator:coordinator];
 
-  BOOL isCompact = NO;
-  if (@available(iOS 10, *)) {
-    isCompact = [self.extensionContext widgetActiveDisplayMode] ==
-                NCWidgetDisplayModeCompact;
-  }
+  BOOL isCompact = [self.extensionContext widgetActiveDisplayMode] ==
+                   NCWidgetDisplayModeCompact;
 
   [coordinator
       animateAlongsideTransition:^(