[IdentityPill] Don't show the pill if signed out while downloading image

This is a fix for the following scenario:
- user signs in or opens Chrome
- image starts downloading
- user signs out
- image download completes
- pill is shown while signed out

The fix is to check that the user is still signed in when the download
completes.

Fixed: 1025674
Change-Id: I780731d23b6e89beba343c27c947c284172584ea
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1919920Reviewed-by: Monica Basta <msalama@chromium.org>
Commit-Queue: David Roger <droger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#716142}

chrome/browser/ui/views/profiles/avatar_toolbar_button.cc

@@ -420,6 +420,16 @@ void AvatarToolbarButton::OnHighlightChanged() {
 void AvatarToolbarButton::ShowIdentityAnimation() {
   DCHECK_EQ(identity_animation_state_,
             IdentityAnimationState::kWaitingForImage);
+
+  // Check that the user is still signed in. See https://crbug.com/1025674
+  CoreAccountInfo user_identity =
+      IdentityManagerFactory::GetForProfile(profile_)
+          ->GetUnconsentedPrimaryAccountInfo();
+  if (user_identity.IsEmpty()) {
+    identity_animation_state_ = IdentityAnimationState::kNotShowing;
+    return;
+  }
+
   identity_animation_state_ = IdentityAnimationState::kShowingUntilTimeout;
 
   UpdateText();