Revert "Reenable PasswordGenerationInteractiveTest.AutoSavingGeneratedPassword."

This reverts commit a2ce204c.

Reason for revert: Sorry, still flaky; see crbug.com/874380

Original change's description:
> Reenable PasswordGenerationInteractiveTest.AutoSavingGeneratedPassword.
> 
> Bug: 791389
> Change-Id: Iea3b6e0f2ec7899e099bd9d7e23017ac4c83e459
> Reviewed-on: https://chromium-review.googlesource.com/1170908
> Reviewed-by: Vadym Doroshenko <dvadym@chromium.org>
> Commit-Queue: Vasilii Sukhanov <vasilii@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#582537}

TBR=vasilii@chromium.org,dvadym@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 791389, 874380
Change-Id: I1551a9ae472ef3e6645622951bdfcd87f2fb74c7
Reviewed-on: https://chromium-review.googlesource.com/1175761Reviewed-by: Morten Stenshorne <mstensho@chromium.org>
Commit-Queue: Morten Stenshorne <mstensho@chromium.org>
Cr-Commit-Position: refs/heads/master@{#583215}

chrome/browser/password_manager/password_generation_interactive_uitest.cc

@@ -300,8 +300,9 @@ IN_PROC_BROWSER_TEST_F(PasswordGenerationInteractiveTest,
   EXPECT_TRUE(GenerationPopupShowing());
 }
 
+// https://crbug.com/791389
 IN_PROC_BROWSER_TEST_F(PasswordGenerationInteractiveTest,
-                       AutoSavingGeneratedPassword) {
+                       DISABLED_AutoSavingGeneratedPassword) {
   scoped_refptr<password_manager::TestPasswordStore> password_store =
       static_cast<password_manager::TestPasswordStore*>(
           PasswordStoreFactory::GetForProfile(
@@ -318,7 +319,9 @@ IN_PROC_BROWSER_TEST_F(PasswordGenerationInteractiveTest,
   content::SimulateKeyPress(WebContents(), ui::DomKey::FromCharacter('U'),
                             ui::DomCode::US_U, ui::VKEY_U, false, false, false,
                             false);
-  WaitForElementValue("username_field", "U");
+  content::SimulateKeyPress(WebContents(), ui::DomKey::FromCharacter('N'),
+                            ui::DomCode::US_N, ui::VKEY_N, false, false, false,
+                            false);
 
   // Submit form.
   NavigationObserver observer(WebContents());
@@ -335,6 +338,6 @@ IN_PROC_BROWSER_TEST_F(PasswordGenerationInteractiveTest,
       password_store->stored_passwords();
   EXPECT_EQ(1u, stored_passwords.size());
   EXPECT_EQ(1u, stored_passwords.begin()->second.size());
-  EXPECT_EQ(base::UTF8ToUTF16("U"),
+  EXPECT_EQ(base::UTF8ToUTF16("UN"),
             (stored_passwords.begin()->second)[0].username_value);
 }