Remove the now-unnecessary RequestTracker in a unit test.

ios/chrome/app/application_delegate/app_state_unittest.mm

Index: ios/chrome/app/application_delegate/app_state_unittest.mm
diff --git a/ios/chrome/app/application_delegate/app_state_unittest.mm b/ios/chrome/app/application_delegate/app_state_unittest.mm
index 15de111c670934ab48b49b4eafd77880591a559f..1608512916053037bd0eb45fad3d7994f9363d37 100644
--- a/ios/chrome/app/application_delegate/app_state_unittest.mm
+++ b/ios/chrome/app/application_delegate/app_state_unittest.mm
@@ -37,7 +37,6 @@
 #include "ios/public/provider/chrome/browser/test_chrome_browser_provider.h"
 #include "ios/public/provider/chrome/browser/user_feedback/test_user_feedback_provider.h"
 #import "ios/testing/ocmock_complex_type_helper.h"
-#include "ios/web/net/request_tracker_impl.h"
 #include "ios/web/public/test/test_web_thread_bundle.h"
 #include "testing/platform_test.h"
 #import "third_party/ocmock/OCMock/OCMock.h"
@@ -288,45 +287,10 @@ class AppStateTest : public PlatformTest {
   __block BOOL metrics_mediator_called_;
 };
 
-// TODO(crbug.com/585700): remove this.
-// Creates a requestTracker, needed for teardown.
-void createTracker(BOOL* created, base::Lock* lock) {
-  web::RequestTrackerImpl::GetTrackerForRequestGroupID(@"test");
-  base::AutoLock scoped_lock(*lock);
-  *created = YES;
-}
-
 // Used to have a thread handling the closing of the IO threads.
 class AppStateWithThreadTest : public PlatformTest {
  protected:
-  AppStateWithThreadTest()
-      : thread_bundle_(web::TestWebThreadBundle::REAL_IO_THREAD) {
-    BOOL created = NO;
-    base::Lock* lock = new base::Lock;
-
-    web::WebThread::PostTask(web::WebThread::IO, FROM_HERE,
-                             base::Bind(&createTracker, &created, lock));
-
-    CFTimeInterval start = CACurrentMediaTime();
-
-    // Poll for at most 1s, waiting for the Tracker creation.
-    while (1) {
-      base::AutoLock scoped_lock(*lock);
-      if (created)
-        return;
-      if (CACurrentMediaTime() - start > 1.0) {
-        trackerCreationFailed();
-        return;
-      }
-      // Ensure that other threads have a chance to run even on a single-core
-      // devices.
-      pthread_yield_np();
-    }
-  }
-
-  void trackerCreationFailed() {
-    FAIL() << "Tracker creation took too much time.";
-  }
+  AppStateWithThreadTest() {}
 
  private:
   web::TestWebThreadBundle thread_bundle_;