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

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

Index: ios/chrome/browser/ui/tab_switcher/session_changes.mm
diff --git a/ios/chrome/browser/ui/tab_switcher/session_changes.mm b/ios/chrome/browser/ui/tab_switcher/session_changes.mm
index 3e06b5245695d93056f71f1bd56783b9cc1f2149..b50ac77c89426520fbc6b631991a3b92ce6905cc 100644
--- a/ios/chrome/browser/ui/tab_switcher/session_changes.mm
+++ b/ios/chrome/browser/ui/tab_switcher/session_changes.mm
@@ -6,14 +6,12 @@
 
 #import "ios/chrome/browser/ui/tab_switcher/tab_switcher_utils.h"
 
-namespace ios_internal {
-
 SessionChanges::SessionChanges(
     std::vector<size_t> const& tabHashesInInitialState,
     std::vector<size_t> const& tabHashesInFinalState) {
-  ios_internal::MinimalReplacementOperations(tabHashesInInitialState,
-                                             tabHashesInFinalState, &updates_,
-                                             &deletions_, &insertions_);
+  TabSwitcherMinimalReplacementOperations(tabHashesInInitialState,
+                                          tabHashesInFinalState, &updates_,
+                                          &deletions_, &insertions_);
 }
 
 SessionChanges::~SessionChanges() {}
@@ -31,5 +29,3 @@ std::vector<size_t> const& SessionChanges::updates() const {
 bool SessionChanges::hasChanges() const {
   return updates_.size() || deletions_.size() || insertions_.size();
 }
-
-}  // namespace ios_internal