[ObjC ARC] Converts ios/chrome/browser/autofill:autofill to ARC.

ios/chrome/browser/autofill/form_suggestion_view.mm

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #import "ios/chrome/browser/autofill/form_suggestion_view.h"
 
 #include "base/i18n/rtl.h"
-#include "base/mac/scoped_nsobject.h"
 #import "components/autofill/ios/browser/form_suggestion.h"
 #import "ios/chrome/browser/autofill/form_suggestion_label.h"
 #import "ios/chrome/browser/autofill/form_suggestion_view_client.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 namespace {
 
 // Vertical margin between suggestions and the edge of the suggestion content
 // frame.
 const CGFloat kSuggestionVerticalMargin = 6;
 
 // Horizontal margin around suggestions (i.e. between suggestions, and between
 // the end suggestions and the suggestion content frame).
 const CGFloat kSuggestionHorizontalMargin = 6;
 
 }  // namespace
 
 @implementation FormSuggestionView {
   // The FormSuggestions that are displayed by this view.
-  base::scoped_nsobject<NSArray> _suggestions;
+  NSArray* _suggestions;
 }
 
 - (instancetype)initWithFrame:(CGRect)frame
                        client:(id<FormSuggestionViewClient>)client
                   suggestions:(NSArray*)suggestions {
   self = [super initWithFrame:frame];
   if (self) {
-    _suggestions.reset([suggestions copy]);
+    _suggestions = [suggestions copy];
 
     self.showsVerticalScrollIndicator = NO;
     self.showsHorizontalScrollIndicator = NO;
     self.bounces = NO;
     self.canCancelContentTouches = YES;
 
     // Total height occupied by the label content, padding, border and margin.
     const CGFloat labelHeight =
         CGRectGetHeight(frame) - kSuggestionVerticalMargin * 2;
 
     __block CGFloat currentX = kSuggestionHorizontalMargin;
     void (^setupBlock)(FormSuggestion* suggestion, NSUInteger idx, BOOL* stop) =
         ^(FormSuggestion* suggestion, NSUInteger idx, BOOL* stop) {
           // FormSuggestionLabel will adjust the width, so here 0 is used for
           // the width.
           CGRect proposedFrame =
               CGRectMake(currentX, kSuggestionVerticalMargin, 0, labelHeight);
-          base::scoped_nsobject<UIView> label([[FormSuggestionLabel alloc]
+          UIView* label = [[FormSuggestionLabel alloc]
               initWithSuggestion:suggestion
                    proposedFrame:proposedFrame
                            index:idx
                   numSuggestions:[_suggestions count]
-                          client:client]);
+                          client:client];
           [self addSubview:label];
           currentX +=
               CGRectGetWidth([label frame]) + kSuggestionHorizontalMargin;
         };
     [_suggestions
         enumerateObjectsWithOptions:(base::i18n::IsRTL() ? NSEnumerationReverse
                                                          : 0)
                          usingBlock:setupBlock];
   }
   return self;
@@ skipping 21 matching lines @@
       // initially visible.
       CGRect initRect = {{contentwidth - CGRectGetWidth(frame), 0}, frame.size};
       [self scrollRectToVisible:initRect animated:NO];
     }
   } else {
     self.contentSize = CGSizeMake(contentwidth, CGRectGetHeight(frame));
   }
 }
 
 - (NSArray*)suggestions {
-  return _suggestions.get();
+  return _suggestions;
 }
 
 @end