Remove default param in GetLocationBarSecurityIconTypeForSecurityState

Call to the method was fixed in
https://chrome-internal.googlesource.com/chrome/ios_internal.git/+/1dc0ccf4574deb1d4a5ea95b2397ba44a5d48e14

Bug: 1020670
Change-Id: I25a2b9768cfcab42e6dd86b25b72cafa1fc76296
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1907077Reviewed-by: Eugene But <eugenebut@chromium.org>
Commit-Queue: Livvie Lin <livvielin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#714961}

ios/chrome/browser/ui/omnibox/omnibox_util.h

@@ -34,11 +34,9 @@ UIImage* GetLocationBarSecurityIcon(LocationBarSecurityIconType icon);
 // Converts the |security_level| to an appropriate security icon type. If
 // |should_downgrade| is true, the info icon should be downgraded to a
 // grey triangle for non-secure connections.
-// TODO(crbug.com/1020670): remove default argument for |should_downgrade|
-// after updating GetLocationBarSecurityIconTypeForSecurityState call.
 LocationBarSecurityIconType GetLocationBarSecurityIconTypeForSecurityState(
     security_state::SecurityLevel security_level,
-    bool should_downgrade = false);
+    bool should_downgrade);
 
 // Converts the |security_level| to an appropriate icon in "always template"
 // rendering mode. If |should_downgrade| is true, the info icon should be