Reland "[iOS][MF] Fix search in all passwords"

This is a reland of b400d6c7

The reason for the revert was that the test failing on the slimnav bot. This
is a legacy bot and runs with the feature off.

After investigating, it turns out it is a bug in Earl Grey where it is waiting
for a view controller to dismiss.

Since slim-navigation is not related to the failure, this CL disables the
test when slim-navigation is off, and relands the fix.

Original change's description:
> [iOS][MF] Fix search in all passwords
>
> If the password view controller was presenting something, it will stay
> around. This is fixed and a test is added.
>
> Bug: 1008421
> Change-Id: I8248cbbf28be94bc4b84c65ccda42129a192db0b
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1826895
> Commit-Queue: Javier Ernesto Flores Robles <javierrobles@chromium.org>
> Reviewed-by: Olivier Robin <olivierrobin@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#702358}

Bug: 1008421
Change-Id: If336b1cc5b4d6427125921d01b636b0726b860f1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1844979Reviewed-by: Olivier Robin <olivierrobin@chromium.org>
Commit-Queue: Javier Ernesto Flores Robles <javierrobles@chromium.org>
Cr-Commit-Position: refs/heads/master@{#704143}

ios/chrome/browser/ui/autofill/manual_fill/all_password_coordinator.mm

@@ -75,7 +75,8 @@
 }
 
 - (void)stop {
-  [self.passwordViewController dismissViewControllerAnimated:YES
+  [self.passwordViewController.presentingViewController
+      dismissViewControllerAnimated:YES
                          completion:nil];
   self.passwordViewController = nil;
   self.passwordMediator = nil;

ios/chrome/browser/ui/autofill/manual_fill/password_view_controller_egtest.mm

@@ -31,6 +31,7 @@
 #import "ios/chrome/test/earl_grey/chrome_test_case.h"
 #import "ios/web/public/test/earl_grey/web_view_matchers.h"
 #include "ios/web/public/test/element_selector.h"
+#import "ios/web/public/web_client.h"
 #include "net/test/embedded_test_server/embedded_test_server.h"
 #include "url/gurl.h"
 
@@ -527,6 +528,45 @@ BOOL WaitForJavaScriptCondition(NSString* java_script_condition) {
   }
 }
 
+// Test that after searching in "Use Other Password" and selecting an option,
+// the screen is dismissed.
+- (void)testOtherPasswordsDismissAfterSearch {
+  // This test is failing on a legacy bot. Return early if running there.
+  if (![ChromeEarlGrey isSlimNavigationManagerEnabled]) {
+    EARL_GREY_TEST_SKIPPED(@"Skipped for Slim Navigation off.");
+  }
+
+  // Bring up the keyboard.
+  [[EarlGrey selectElementWithMatcher:chrome_test_util::WebViewMatcher()]
+      performAction:TapWebElementWithId(kFormElementUsername)];
+
+  // Tap the passwords icon.
+  [[EarlGrey selectElementWithMatcher:PasswordIconMatcher()]
+      performAction:grey_tap()];
+
+  // Tap "Use Other Password...".
+  [[EarlGrey selectElementWithMatcher:OtherPasswordsMatcher()]
+      performAction:grey_tap()];
+
+  // Verify "Use Other Passwords" opened.
+  [[EarlGrey selectElementWithMatcher:OtherPasswordsDismissMatcher()]
+      assertWithMatcher:grey_sufficientlyVisible()];
+
+  // Tap the password search bar.
+  [[EarlGrey selectElementWithMatcher:PasswordSearchBarMatcher()]
+      performAction:grey_typeText(@"user")];
+
+  // Select a username.
+  [[EarlGrey selectElementWithMatcher:UsernameButtonMatcher()]
+      performAction:grey_tap()];
+
+  // Verify the password list disappears.
+  [[EarlGrey selectElementWithMatcher:PasswordSearchBarMatcher()]
+      assertWithMatcher:grey_nil()];
+  [[EarlGrey selectElementWithMatcher:OtherPasswordsMatcher()]
+      assertWithMatcher:grey_nil()];
+}
+
 // Tests that the Password View Controller is dismissed when tapping the
 // keyboard icon.
 - (void)testKeyboardIconDismissPasswordController {