Apply safe area to omnibox popup width.

Although the omnibox popup itself honors safe are in the table view, the width
of the omnibox pop text can be too wide.

Bug: 787164
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: If10523863a4ffd404a8c255bbad6b5219aa534e1
Reviewed-on: https://chromium-review.googlesource.com/807784Reviewed-by: Stepan Khapugin <stkhapugin@chromium.org>
Commit-Queue: Justin Cohen <justincohen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#521688}

ios/chrome/browser/ui/omnibox/omnibox_popup_view_controller.mm

@@ -231,8 +231,10 @@ UIColor* BackgroundColorIncognito() {
   [detailTextLabel setTextAlignment:_alignment];
 
   // The width must be positive for CGContextRef to be valid.
-  CGFloat labelWidth =
-      MAX(40, floorf(row.frame.size.width) - kTextCellLeadingPadding);
+  UIEdgeInsets safeAreaInsets = SafeAreaInsetsForView(row);
+  CGFloat labelWidth = MAX(
+      40, floorf(UIEdgeInsetsInsetRect(row.bounds, safeAreaInsets).size.width) -
+              kTextCellLeadingPadding);
   CGFloat labelHeight =
       match.hasAnswer ? kAnswerLabelHeight : kTextDetailLabelHeight;
   CGFloat answerImagePadding = kAnswerImageWidth + kAnswerImageRightPadding;