[ios] Remove stack view perf test and unneeded TabSwitcherDelegate me…

…thod.

This CL removes stack_view_controller_perftest, whose two tests have been disabled for a long
time. That test was the only code that used the TabSwitcherDelegate method
-tabSwitcherPresentationTransitionDidEnd:, which is also deleted.

Bug: 546328,717314
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: I5b4c923a1db1e0af435ec0aa284af82d415edef5
Reviewed-on: https://chromium-review.googlesource.com/914964
Reviewed-by: Menglu Huang <huangml@chromium.org>
Commit-Queue: Mark Cogan <marq@chromium.org>
Cr-Commit-Position: refs/heads/master@{#536240}

ios/chrome/app/main_controller.mm

@@ -2021,9 +2021,6 @@ - (void)finishDismissingStackView {
   _dismissingStackView = NO;
 }
 
-- (void)tabSwitcherPresentationTransitionDidEnd:(id<TabSwitcher>)tabSwitcher {
-}
-
 - (id<ToolbarOwner>)tabSwitcherTransitionToolbarOwner {
   // Request the view to ensure that the view has been loaded and initialized,
   // since it may never have been loaded (or have been swapped out).

ios/chrome/browser/ui/stack_view/BUILD.gn

@@ -134,24 +134,3 @@ source_set("eg_tests") {
   ]
   libs = [ "XCTest.framework" ]
 }
-
-source_set("perf_tests") {
-  configs += [ "//build/config/compiler:enable_arc" ]
-  testonly = true
-  sources = [
-    "stack_view_controller_perftest.mm",
-  ]
-  deps = [
-    ":stack_view",
-    "//base",
-    "//base/test:test_support",
-    "//ios/chrome/browser/snapshots",
-    "//ios/chrome/browser/tabs",
-    "//ios/chrome/browser/test:perf_test_support",
-    "//ios/chrome/browser/ui",
-    "//ios/chrome/browser/ui:ui_internal",
-    "//ios/web",
-    "//net",
-  ]
-  libs = [ "UIKit.framework" ]
-}

ios/chrome/browser/ui/stack_view/stack_view_controller.mm

@@ -1660,7 +1660,6 @@ - (void)notifyDelegatesTransitionFinished {
   if (self.transitionStyle == STACK_TRANSITION_STYLE_PRESENTING) {
     [_testDelegate stackViewControllerShowWithSelectedTabAnimationDidEnd];
     [_animationDelegate tabSwitcherPresentationAnimationDidEnd:self];
-    [_delegate tabSwitcherPresentationTransitionDidEnd:self];
   } else {
     [_animationDelegate tabSwitcherDismissalAnimationDidEnd:self];
     [_delegate tabSwitcherDismissTransitionDidEnd:self];