[iOS/ARC] Fix a violation of ODR in base::BindBlock under ARC.

ios/chrome/browser/share_extension/share_extension_item_receiver.mm

Index: ios/chrome/browser/share_extension/share_extension_item_receiver.mm
diff --git a/ios/chrome/browser/share_extension/share_extension_item_receiver.mm b/ios/chrome/browser/share_extension/share_extension_item_receiver.mm
index 0bf45a96f6930e3e606573e59ed36d3ed25fe680..bbe2a572aa0f3d512a19547e3131adfd3d4d90bb 100644
--- a/ios/chrome/browser/share_extension/share_extension_item_receiver.mm
+++ b/ios/chrome/browser/share_extension/share_extension_item_receiver.mm
@@ -110,7 +110,7 @@ void LogHistogramReceivedItem(ShareExtensionItemReceived type) {
   _bookmarkModel = bookmarkModel;
 
   web::WebThread::PostTask(web::WebThread::FILE, FROM_HERE,
-                           base::BindBlock(^() {
+                           base::BindBlockArc(^() {
                              [self createReadingListFolder];
                            }));
   [[NSNotificationCenter defaultCenter]
@@ -149,7 +149,7 @@ void LogHistogramReceivedItem(ShareExtensionItemReceived type) {
                               error:nil];
   }
   web::WebThread::PostTask(
-      web::WebThread::UI, FROM_HERE, base::BindBlock(^() {
+      web::WebThread::UI, FROM_HERE, base::BindBlockArc(^() {
         if ([[UIApplication sharedApplication] applicationState] ==
             UIApplicationStateActive) {
           _folderCreated = YES;
@@ -205,7 +205,8 @@ void LogHistogramReceivedItem(ShareExtensionItemReceived type) {
                           [[NSDate date] timeIntervalSinceDate:entryDate]));
 
   // Entry is valid. Add it to the reading list model.
-  web::WebThread::PostTask(web::WebThread::UI, FROM_HERE, base::BindBlock(^() {
+  web::WebThread::PostTask(web::WebThread::UI, FROM_HERE,
+                           base::BindBlockArc(^() {
                              if (!_readingListModel || !_bookmarkModel) {
                                // Models may have been deleted after the file
                                // processing started.
@@ -228,7 +229,7 @@ void LogHistogramReceivedItem(ShareExtensionItemReceived type) {
                              if (completion) {
                                web::WebThread::PostTask(web::WebThread::FILE,
                                                         FROM_HERE,
-                                                        base::BindBlock(^() {
+                                                        base::BindBlockArc(^() {
                                                           completion();
                                                         }));
                              }
@@ -292,7 +293,7 @@ void LogHistogramReceivedItem(ShareExtensionItemReceived type) {
 
   // There may already be files. Process them.
   web::WebThread::PostTask(
-      web::WebThread::FILE, FROM_HERE, base::BindBlock(^() {
+      web::WebThread::FILE, FROM_HERE, base::BindBlockArc(^() {
         NSArray<NSURL*>* files = [[NSFileManager defaultManager]
               contentsOfDirectoryAtURL:[self presentedItemURL]
             includingPropertiesForKeys:nil
@@ -302,7 +303,7 @@ void LogHistogramReceivedItem(ShareExtensionItemReceived type) {
           return;
         }
         web::WebThread::PostTask(
-            web::WebThread::UI, FROM_HERE, base::BindBlock(^() {
+            web::WebThread::UI, FROM_HERE, base::BindBlockArc(^() {
               UMA_HISTOGRAM_COUNTS_100(
                   "IOS.ShareExtension.ReceivedEntriesCount", [files count]);
               for (NSURL* fileURL : files) {
@@ -310,12 +311,12 @@ void LogHistogramReceivedItem(ShareExtensionItemReceived type) {
                     ReadingListModel::ScopedReadingListBatchUpdate>
                     batchToken(_readingListModel->BeginBatchUpdates());
                 web::WebThread::PostTask(
-                    web::WebThread::FILE, FROM_HERE, base::BindBlock(^() {
+                    web::WebThread::FILE, FROM_HERE, base::BindBlockArc(^() {
                       [self handleFileAtURL:fileURL
                              withCompletion:^{
                                web::WebThread::PostTask(web::WebThread::UI,
                                                         FROM_HERE,
-                                                        base::BindBlock(^() {
+                                                        base::BindBlockArc(^() {
                                                           batchToken.reset();
                                                         }));
                              }];
@@ -338,7 +339,7 @@ void LogHistogramReceivedItem(ShareExtensionItemReceived type) {
 
 - (void)presentedSubitemDidChangeAtURL:(NSURL*)url {
   web::WebThread::PostTask(web::WebThread::FILE, FROM_HERE,
-                           base::BindBlock(^() {
+                           base::BindBlockArc(^() {
                              [self handleFileAtURL:url withCompletion:nil];
                            }));
 }