[sheriff] Disable ChooseAvatarIconIndexForNewProfile on all bots.

TBR=droger@chromium.org,lwchkg@chromium.org,msarda@chromium.org
NOTRY=true

Bug: 938707
Change-Id: I3b421e177f303135d633987d5429eaada474243a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1504656Reviewed-by: Darren Shen <shend@chromium.org>
Commit-Queue: Darren Shen <shend@chromium.org>
Cr-Commit-Position: refs/heads/master@{#637994}

chrome/browser/profiles/profile_attributes_storage_unittest.cc

@@ -590,7 +590,8 @@ TEST_F(ProfileAttributesStorageTest, AccessFromElsewhere) {
   EXPECT_EQ(base::ASCIIToUTF16("OtherNewName"), first_entry->GetName());
 }
 
-TEST_F(ProfileAttributesStorageTest, ChooseAvatarIconIndexForNewProfile) {
+TEST_F(ProfileAttributesStorageTest,
+       DISABLED_ChooseAvatarIconIndexForNewProfile) {
   size_t total_icon_count = profiles::GetDefaultAvatarIconCount();
 #if defined(OS_CHROMEOS) || defined(OS_ANDROID)
   size_t generic_icon_count = profiles::GetGenericAvatarIconCount();