Fix ios_chrome_unittests to crash on DCHECK failure.

ios/chrome/browser/ui/settings/autofill_collection_view_controller_unittest.mm

Index: ios/chrome/browser/ui/settings/autofill_collection_view_controller_unittest.mm
diff --git a/ios/chrome/browser/ui/settings/autofill_collection_view_controller_unittest.mm b/ios/chrome/browser/ui/settings/autofill_collection_view_controller_unittest.mm
index 9cfbadc32ab567a0b11eb26be3f00d34c258ee48..41ae1eac736aa9bcaafd2f9baab66807a2eb9d66 100644
--- a/ios/chrome/browser/ui/settings/autofill_collection_view_controller_unittest.mm
+++ b/ios/chrome/browser/ui/settings/autofill_collection_view_controller_unittest.mm
@@ -14,6 +14,7 @@
 #include "ios/chrome/browser/autofill/personal_data_manager_factory.h"
 #include "ios/chrome/browser/browser_state/test_chrome_browser_state.h"
 #import "ios/chrome/browser/ui/collection_view/collection_view_controller_test.h"
+#include "ios/chrome/browser/ui/settings/personal_data_manager_data_changed_observer.h"
 #include "ios/web/public/test/test_web_thread_bundle.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
@@ -26,8 +27,7 @@ namespace {
 class AutofillCollectionViewControllerTest
     : public CollectionViewControllerTest {
  protected:
-  void SetUp() override {
-    CollectionViewControllerTest::SetUp();
+  AutofillCollectionViewControllerTest() {
     TestChromeBrowserState::Builder test_cbs_builder;
     chrome_browser_state_ = test_cbs_builder.Build();
     // Profile import requires a PersonalDataManager which itself needs the
@@ -44,14 +44,17 @@ class AutofillCollectionViewControllerTest
   void AddProfile(const std::string& origin,
                   const std::string& name,
                   const std::string& address) {
-    autofill::PersonalDataManager* personalDataManager =
+    autofill::PersonalDataManager* personal_data_manager =
         autofill::PersonalDataManagerFactory::GetForBrowserState(
             chrome_browser_state_.get());
-    autofill::AutofillProfile autofillProfile(base::GenerateGUID(), origin);
-    autofillProfile.SetRawInfo(autofill::NAME_FULL, base::ASCIIToUTF16(name));
-    autofillProfile.SetRawInfo(autofill::ADDRESS_HOME_LINE1,
-                               base::ASCIIToUTF16(address));
-    personalDataManager->SaveImportedProfile(autofillProfile);
+    PersonalDataManagerDataChangedObserver observer(personal_data_manager);
+
+    autofill::AutofillProfile autofill_profile(base::GenerateGUID(), origin);
+    autofill_profile.SetRawInfo(autofill::NAME_FULL, base::ASCIIToUTF16(name));
+    autofill_profile.SetRawInfo(autofill::ADDRESS_HOME_LINE1,
+                                base::ASCIIToUTF16(address));
+    personal_data_manager->SaveImportedProfile(autofill_profile);
+    observer.Wait();  // Wait for completion of the asynchronous operation.
   }
 
   web::TestWebThreadBundle thread_bundle_;
@@ -83,16 +86,20 @@ TEST_F(AutofillCollectionViewControllerTest, TestOneProfile) {
 
 // Adding a single credit card results in a credit card section.
 TEST_F(AutofillCollectionViewControllerTest, TestOneCreditCard) {
-  autofill::PersonalDataManager* personalDataManager =
+  autofill::PersonalDataManager* personal_data_manager =
       autofill::PersonalDataManagerFactory::GetForBrowserState(
           chrome_browser_state_.get());
-  autofill::CreditCard creditCard(base::GenerateGUID(),
-                                  "https://www.example.com/");
-  creditCard.SetRawInfo(autofill::CREDIT_CARD_NAME_FULL,
-                        base::ASCIIToUTF16("Alan Smithee"));
-  creditCard.SetRawInfo(autofill::CREDIT_CARD_NUMBER,
-                        base::ASCIIToUTF16("378282246310005"));
-  personalDataManager->SaveImportedCreditCard(creditCard);
+  PersonalDataManagerDataChangedObserver observer(personal_data_manager);
+
+  autofill::CreditCard credit_card(base::GenerateGUID(),
+                                   "https://www.example.com/");
+  credit_card.SetRawInfo(autofill::CREDIT_CARD_NAME_FULL,
+                         base::ASCIIToUTF16("Alan Smithee"));
+  credit_card.SetRawInfo(autofill::CREDIT_CARD_NUMBER,
+                         base::ASCIIToUTF16("378282246310005"));
+  personal_data_manager->SaveImportedCreditCard(credit_card);
+  observer.Wait();  // Wait for completion of the asynchronous operation.
+
   CreateController();
   // Expect two sections (header and credit card section).
   EXPECT_EQ(2, NumberOfSections());
@@ -117,6 +124,7 @@ TEST_F(AutofillCollectionViewControllerTest, TestOneProfileItemDeleted) {
       base::mac::ObjCCastStrict<AutofillCollectionViewController>(controller());
   // Put the collectionView in 'edit' mode.
   [view_controller editButtonPressed];
+
   // This is a bit of a shortcut, since actually clicking on the 'delete'
   // button would be tough.
   void (^delete_item_with_wait)(int, int) = ^(int i, int j) {
@@ -129,7 +137,16 @@ TEST_F(AutofillCollectionViewControllerTest, TestOneProfileItemDeleted) {
     });
   };
 
+  autofill::PersonalDataManager* personal_data_manager =
+      autofill::PersonalDataManagerFactory::GetForBrowserState(
+          chrome_browser_state_.get());
+  PersonalDataManagerDataChangedObserver observer(personal_data_manager);
+
+  // This call cause a modification of the PersonalDataManager, so wait until
+  // the asynchronous task complete in addition to waiting for the UI update.
   delete_item_with_wait(1, 0);
+  observer.Wait();  // Wait for completion of the asynchronous operation.
+
   // Exit 'edit' mode.
   [view_controller editButtonPressed];