Fix include guards of files in src/ios.

ios/chrome/browser/share_extension/share_extension_item_receiver.h

Index: ios/chrome/browser/share_extension/share_extension_item_receiver.h
diff --git a/ios/chrome/browser/share_extension/share_extension_item_receiver.h b/ios/chrome/browser/share_extension/share_extension_item_receiver.h
index 5cdd2fdb4722def833f8a7251447178a66372316..409d018cc9e788deecfaba75f062b6f9213a49df 100644
--- a/ios/chrome/browser/share_extension/share_extension_item_receiver.h
+++ b/ios/chrome/browser/share_extension/share_extension_item_receiver.h
@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef IOS_CHROME_BROWSER_UI_SHARE_EXTENSION_SHARE_EXTENSION_ITEM_RECEIVER_H_
-#define IOS_CHROME_BROWSER_UI_SHARE_EXTENSION_SHARE_EXTENSION_ITEM_RECEIVER_H_
+#ifndef IOS_CHROME_BROWSER_SHARE_EXTENSION_SHARE_EXTENSION_ITEM_RECEIVER_H_
+#define IOS_CHROME_BROWSER_SHARE_EXTENSION_SHARE_EXTENSION_ITEM_RECEIVER_H_
 
 #import <Foundation/Foundation.h>
 
@@ -32,4 +32,4 @@ class ReadingListModel;
 
 @end
 
-#endif  // IOS_CHROME_BROWSER_UI_SHARE_EXTENSION_SHARE_EXTENSION_ITEM_RECEIVER_H_
+#endif  // IOS_CHROME_BROWSER_SHARE_EXTENSION_SHARE_EXTENSION_ITEM_RECEIVER_H_