[iOS Clean] Removed old overlay implementation.

ios/shared/chrome/browser/ui/coordinators/browser_coordinator_unittest.mm

Index: ios/shared/chrome/browser/ui/coordinators/browser_coordinator_unittest.mm
diff --git a/ios/shared/chrome/browser/ui/coordinators/browser_coordinator_unittest.mm b/ios/shared/chrome/browser/ui/coordinators/browser_coordinator_unittest.mm
index b9ca22fce2e31df03feb3c95c7668a8068d0304a..a788ce006d59e643274683b00907f9ea16d57b94 100644
--- a/ios/shared/chrome/browser/ui/coordinators/browser_coordinator_unittest.mm
+++ b/ios/shared/chrome/browser/ui/coordinators/browser_coordinator_unittest.mm
@@ -121,55 +121,6 @@ - (BOOL)canAddOverlayCoordinator:(BrowserCoordinator*)overlayCoordinator {
   EXPECT_EQ(otherParent, otherChild.parentCoordinator);
 }
 
-TEST_F(BrowserCoordinatorTest, TestOverlay) {
-  TestCoordinator* parent = [[TestCoordinator alloc] init];
-  TestCoordinator* child = [[TestCoordinator alloc] init];
-  TestCoordinator* grandchild = [[TestCoordinator alloc] init];
-  TestCoordinator* overlay = [[TestCoordinator alloc] init];
-  TestCoordinator* secondOverlay = [[TestCoordinator alloc] init];
-
-  EXPECT_TRUE([parent canAddOverlayCoordinator:overlay]);
-  [parent addChildCoordinator:child];
-  [child addChildCoordinator:grandchild];
-  EXPECT_FALSE([parent canAddOverlayCoordinator:overlay]);
-  EXPECT_FALSE([child canAddOverlayCoordinator:overlay]);
-  EXPECT_TRUE([grandchild canAddOverlayCoordinator:overlay]);
-  EXPECT_FALSE([grandchild canAddOverlayCoordinator:child]);
-
-  EXPECT_FALSE(overlay.overlaying);
-  [parent addOverlayCoordinator:overlay];
-  EXPECT_TRUE(overlay.overlaying);
-  EXPECT_EQ(overlay, parent.overlayCoordinator);
-  EXPECT_EQ(overlay, child.overlayCoordinator);
-  EXPECT_EQ(overlay, grandchild.overlayCoordinator);
-  EXPECT_TRUE([grandchild.children containsObject:overlay]);
-  EXPECT_EQ(grandchild, overlay.parentCoordinator);
-
-  // Shouldn't be able to add a second overlaying coordinator.
-  EXPECT_FALSE([grandchild canAddOverlayCoordinator:secondOverlay]);
-  EXPECT_FALSE(secondOverlay.overlaying);
-  [parent addOverlayCoordinator:secondOverlay];
-  EXPECT_FALSE(secondOverlay.overlaying);
-
-  [child removeOverlayCoordinator];
-  EXPECT_FALSE(overlay.overlaying);
-  EXPECT_EQ(nil, parent.overlayCoordinator);
-  EXPECT_EQ(nil, child.overlayCoordinator);
-  EXPECT_EQ(nil, grandchild.overlayCoordinator);
-  EXPECT_FALSE([grandchild.children containsObject:overlay]);
-  EXPECT_EQ(nil, overlay.parentCoordinator);
-
-  // An implementation that doesn't allow any overlays shouldn't get one.
-  NonOverlayableCoordinator* noOverlays =
-      [[NonOverlayableCoordinator alloc] init];
-  TestCoordinator* thirdOverlay = [[TestCoordinator alloc] init];
-
-  EXPECT_FALSE([noOverlays canAddOverlayCoordinator:thirdOverlay]);
-  EXPECT_FALSE(thirdOverlay.overlaying);
-  [noOverlays addOverlayCoordinator:thirdOverlay];
-  EXPECT_FALSE(thirdOverlay.overlaying);
-}
-
 TEST_F(BrowserCoordinatorTest, AddedRemoved) {
   TestCoordinator* parent = [[TestCoordinator alloc] init];
   TestCoordinator* child = [[TestCoordinator alloc] init];