Remove deprecated method of TestChromeBrowserState

Two overloads of TestChromeBrowserState::AddTestingFactory
were introduced to prevent downstream tree while landing CL
https://crrev.com/c/1235718.

Remove them as the downstream tree has been ported to the
new API.

Bug: 809610
Cq-Include-Trybots: luci.chromium.try:ios-simulator-cronet;luci.chromium.try:ios-simulator-full-configs
Change-Id: I802f40e3a31ccb306fb08a1d8256ac12674b8702
Reviewed-on: https://chromium-review.googlesource.com/1248703Reviewed-by: Olivier Robin <olivierrobin@chromium.org>
Commit-Queue: Sylvain Defresne <sdefresne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#595016}

ios/chrome/browser/browser_state/test_chrome_browser_state.h

@@ -103,17 +103,6 @@ class TestChromeBrowserState : public ios::ChromeBrowserState {
         RefcountedBrowserStateKeyedServiceFactory::TestingFactory
             testing_factory);
 
-    // Deprecated, do not use. This is kept for compatibility with downstream
-    // code and will be removed as soon as the downstream code has been fixed
-    // to use the new interface.
-    void AddTestingFactory(
-        BrowserStateKeyedServiceFactory* service_factory,
-        std::unique_ptr<KeyedService> (*testing_factory)(web::BrowserState*));
-    void AddTestingFactory(
-        RefcountedBrowserStateKeyedServiceFactory* service_factory,
-        scoped_refptr<RefcountedKeyedService> (*testing_factory)(
-            web::BrowserState*));
-
     // Sets the path to the directory to be used to hold ChromeBrowserState
     // data.
     void SetPath(const base::FilePath& path);

ios/chrome/browser/browser_state/test_chrome_browser_state.mm

@@ -377,25 +377,6 @@ void TestChromeBrowserState::Builder::AddTestingFactory(
                                              std::move(testing_factory));
 }
 
-void TestChromeBrowserState::Builder::AddTestingFactory(
-    BrowserStateKeyedServiceFactory* service_factory,
-    std::unique_ptr<KeyedService> (*testing_factory)(web::BrowserState*)) {
-  BrowserStateKeyedServiceFactory::TestingFactory wrapped_factory;
-  if (testing_factory)
-    wrapped_factory = base::BindRepeating(testing_factory);
-  AddTestingFactory(service_factory, std::move(wrapped_factory));
-}
-
-void TestChromeBrowserState::Builder::AddTestingFactory(
-    RefcountedBrowserStateKeyedServiceFactory* service_factory,
-    scoped_refptr<RefcountedKeyedService> (*testing_factory)(
-        web::BrowserState*)) {
-  RefcountedBrowserStateKeyedServiceFactory::TestingFactory wrapped_factory;
-  if (testing_factory)
-    wrapped_factory = base::BindRepeating(testing_factory);
-  AddTestingFactory(service_factory, std::move(wrapped_factory));
-}
-
 void TestChromeBrowserState::Builder::SetPath(const base::FilePath& path) {
   DCHECK(!build_called_);
   state_path_ = path;