[ios] Moves tab_switcher code out of the ios_internal namespace.

ios/chrome/browser/ui/tab_switcher/session_changes.h

Index: ios/chrome/browser/ui/tab_switcher/session_changes.h
diff --git a/ios/chrome/browser/ui/tab_switcher/session_changes.h b/ios/chrome/browser/ui/tab_switcher/session_changes.h
index a765f4f8874419b96a7212ab1f96c3d2fce316ee..73b6b1e30b38ad1a2e8df4e6d40f514c775b34b4 100644
--- a/ios/chrome/browser/ui/tab_switcher/session_changes.h
+++ b/ios/chrome/browser/ui/tab_switcher/session_changes.h
@@ -7,8 +7,6 @@
 
 #include <vector>
 
-namespace ios_internal {
-
 // This structure represents the changes a session undergoes.
 // It is used to update the UICollectionView showing a set of tabs.
 class SessionChanges {
@@ -41,6 +39,4 @@ class SessionChanges {
   std::vector<size_t> updates_;
 };
 
-}  // namespace ios_internal
-
 #endif  // IOS_CHROME_BROWSER_UI_TAB_SWITCHER_SESSION_CHANGES_H_