Remove Tab's |-url| property.

ios/chrome/browser/tabs/tab.h

Index: ios/chrome/browser/tabs/tab.h
diff --git a/ios/chrome/browser/tabs/tab.h b/ios/chrome/browser/tabs/tab.h
index 075f848a416eda07391701c432525a96aa644fe6..b7a857b2a38038f868f05d86f5f4057489a253ab 100644
--- a/ios/chrome/browser/tabs/tab.h
+++ b/ios/chrome/browser/tabs/tab.h
@@ -101,11 +101,6 @@ extern NSString* const kProxyPassthroughHeaderValue;
 // Browser state associated with this Tab.
 @property(nonatomic, readonly) ios::ChromeBrowserState* browserState;
 
-// TODO(crbug.com/546208): Eliminate this; replace calls with either visible URL
-// or last committed URL, depending on the specific use case.
-// Do not add new calls to this method.
-@property(nonatomic, readonly) const GURL& url;
-
 // Returns the URL of the last committed NavigationItem for this Tab.
 @property(nonatomic, readonly) const GURL& lastCommittedURL;