Remove deprecated wait_util methods.

ios/chrome/browser/ui/omnibox_perftest.mm

Index: ios/chrome/browser/ui/omnibox_perftest.mm
diff --git a/ios/chrome/browser/ui/omnibox_perftest.mm b/ios/chrome/browser/ui/omnibox_perftest.mm
index e4e24f8ca034b8e8f31214a7f94d7072ecca5165..0c59ec7a32f9fa135fc15196f65c30d1dcf5b962 100644
--- a/ios/chrome/browser/ui/omnibox_perftest.mm
+++ b/ios/chrome/browser/ui/omnibox_perftest.mm
@@ -159,7 +159,7 @@ class OmniboxPerfTest : public PerfTest {
         ^bool() {
           return [keyboard_listener_ isKeyboardVisible];
         },
-        nullptr, base::TimeDelta());
+        false, base::TimeDelta());
     base::test::ios::TimeUntilCondition(
         ^{
           [textField resignFirstResponder];
@@ -167,7 +167,7 @@ class OmniboxPerfTest : public PerfTest {
         ^bool() {
           return ![keyboard_listener_ isKeyboardVisible];
         },
-        nullptr, base::TimeDelta());
+        false, base::TimeDelta());
     [textField removeFromSuperview];
     return elapsed;
   }
@@ -182,7 +182,7 @@ class OmniboxPerfTest : public PerfTest {
         ^bool() {
           return [keyboard_listener_ isKeyboardVisible];
         },
-        nullptr, base::TimeDelta());
+        false, base::TimeDelta());
   }
 
   // Performs necessary cleanup (so next pass of unit test can start from
@@ -197,7 +197,7 @@ class OmniboxPerfTest : public PerfTest {
         ^bool() {
           return ![keyboard_listener_ isKeyboardVisible];
         },
-        nullptr, base::TimeDelta());
+        false, base::TimeDelta());
   }
 
   std::unique_ptr<TestChromeBrowserState> chrome_browser_state_;