Removed ChromeBrowserState::AsTestChromeBrowserState.

ios/chrome/browser/browser_state/chrome_browser_state.h

Index: ios/chrome/browser/browser_state/chrome_browser_state.h
diff --git a/ios/chrome/browser/browser_state/chrome_browser_state.h b/ios/chrome/browser/browser_state/chrome_browser_state.h
index 32dce8f7d95f0d37a9d7f653d902888cbbc24daa..6f4287ad30fcd2428de90dad721b31e39f50302d 100644
--- a/ios/chrome/browser/browser_state/chrome_browser_state.h
+++ b/ios/chrome/browser/browser_state/chrome_browser_state.h
@@ -128,13 +128,6 @@ class ChromeBrowserState : public web::BrowserState {
   virtual net::URLRequestContextGetter* CreateIsolatedRequestContext(
       const base::FilePath& partition_path) = 0;
 
-  // Returns the current ChromeBrowserState casted as a TestChromeBrowserState
-  // or null if it is not a TestChromeBrowserState.
-  // TODO(crbug.com/583682): This method should not be used. It is there for
-  // supporting a legacy test, and will be removed as soon as the deprecated
-  // test is removed.
-  virtual TestChromeBrowserState* AsTestChromeBrowserState();
-
   // web::BrowserState
   net::URLRequestContextGetter* GetRequestContext() override;