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

ios/chrome/browser/ui/key_commands_provider.mm

 // Copyright 2016 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/ui/key_commands_provider.h"
 
-#import "base/ios/weak_nsobject.h"
 #include "base/logging.h"
 #include "components/strings/grit/components_strings.h"
 #import "ios/chrome/browser/ui/commands/generic_chrome_command.h"
 #include "ios/chrome/browser/ui/commands/ios_command_ids.h"
 #import "ios/chrome/browser/ui/keyboard/UIKeyCommand+Chrome.h"
 #include "ios/chrome/browser/ui/rtl_geometry.h"
 #include "ios/chrome/grit/ios_strings.h"
 #include "ui/base/l10n/l10n_util_mac.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 @implementation KeyCommandsProvider
 
 - (NSArray*)keyCommandsForConsumer:(id<KeyCommandsPlumbing>)consumer
                        editingText:(BOOL)editingText {
-  base::WeakNSProtocol<id<KeyCommandsPlumbing>> weakConsumer(consumer);
+  __weak id<KeyCommandsPlumbing> weakConsumer = consumer;
 
   // Block to execute a command from the |tag|.
-  void (^execute)(NSInteger) = [[^(NSInteger tag) {
+  void (^execute)(NSInteger) = ^(NSInteger tag) {
     [weakConsumer
         chromeExecuteCommand:[GenericChromeCommand commandWithTag:tag]];
-  } copy] autorelease];
+  };
 
   // Block to have the tab model open the tab at |index|, if there is one.
-  void (^focusTab)(NSUInteger) = [[^(NSUInteger index) {
+  void (^focusTab)(NSUInteger) = ^(NSUInteger index) {
     [weakConsumer focusTabAtIndex:index];
-  } copy] autorelease];
+  };
 
   const BOOL hasTabs = [consumer tabsCount] > 0;
 
   const BOOL useRTLLayout = UseRTLLayout();
   const NSInteger browseLeft = useRTLLayout ? IDC_FORWARD : IDC_BACK;
   const NSInteger browseRight = useRTLLayout ? IDC_BACK : IDC_FORWARD;
   const int browseLeftDescriptionID = useRTLLayout
                                           ? IDS_IOS_KEYBOARD_HISTORY_FORWARD
                                           : IDS_IOS_KEYBOARD_HISTORY_BACK;
   const int browseRightDescriptionID = useRTLLayout
                                            ? IDS_IOS_KEYBOARD_HISTORY_BACK
                                            : IDS_IOS_KEYBOARD_HISTORY_FORWARD;
-  BOOL (^canBrowseLeft)() = [[^() {
+  BOOL (^canBrowseLeft)() = ^() {
     return useRTLLayout ? [weakConsumer canGoForward]
                         : [weakConsumer canGoBack];
-  } copy] autorelease];
-  BOOL (^canBrowseRight)() = [[^() {
+  };
+  BOOL (^canBrowseRight)() = ^() {
     return useRTLLayout ? [weakConsumer canGoBack]
                         : [weakConsumer canGoForward];
-  } copy] autorelease];
+  };
 
   // Initialize the array of commands with an estimated capacity.
   NSMutableArray* keyCommands = [NSMutableArray arrayWithCapacity:32];
 
   // List the commands that always appear in the HUD. They appear in the HUD
   // since they have titles.
   [keyCommands addObjectsFromArray:@[
     [UIKeyCommand cr_keyCommandWithInput:@"t"
                            modifierFlags:UIKeyModifierCommand
                                    title:l10n_util::GetNSStringWithFixup(
@@ skipping 249 matching lines @@
                           action:^{
                             [weakConsumer focusNextTab];
                           }],
     ]];
   }
 
   return keyCommands;
 }
 
 @end