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

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

Index: ios/chrome/browser/ui/tab_switcher/tab_switcher_utils_unittest.mm
diff --git a/ios/chrome/browser/ui/tab_switcher/tab_switcher_utils_unittest.mm b/ios/chrome/browser/ui/tab_switcher/tab_switcher_utils_unittest.mm
index 37d45374f1125b92ed59f3df80829e0a8bb623e2..1ccdee36cf395fc73f40a94568838545d6b51859 100644
--- a/ios/chrome/browser/ui/tab_switcher/tab_switcher_utils_unittest.mm
+++ b/ios/chrome/browser/ui/tab_switcher/tab_switcher_utils_unittest.mm
@@ -18,8 +18,8 @@ class TabSwitcherUtilsTest : public PlatformTest {
     std::vector<size_t> substitutions;
     std::vector<size_t> deletions;
     std::vector<size_t> insertions;
-    ios_internal::MinimalReplacementOperations(initial, final, &substitutions,
-                                               &deletions, &insertions);
+    TabSwitcherMinimalReplacementOperations(initial, final, &substitutions,
+                                            &deletions, &insertions);
     EXPECT_EQ(substitutions, expectedSubstitutions);
     EXPECT_EQ(deletions, expectedDeletions);
     EXPECT_EQ(insertions, expectedInsertions);