[ios] Use chrome_browser_state_forward.h in /ios/chrome/browser/invalidation

Instead of forward declaring ChromeBrowserState in the ios
namespace, use a header. This will allow moving the class
to the global namespace without having to change all the
forward declaration at the same time.

This CL was uploaded by git cl split.

R=melandory@chromium.org

Bug: 1042208
Change-Id: I80b1b804c9c2f9938fd2f3fb3051623871cb0253
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2010821
Auto-Submit: Sylvain Defresne <sdefresne@chromium.org>
Commit-Queue: Sylvain Defresne <sdefresne@chromium.org>
Commit-Queue: Marc Treib <treib@chromium.org>
Reviewed-by: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#734003}

ios/chrome/browser/invalidation/ios_chrome_deprecated_profile_invalidation_provider_factory.h

@@ -10,15 +10,12 @@
 #include "base/macros.h"
 #include "base/no_destructor.h"
 #include "components/keyed_service/ios/browser_state_keyed_service_factory.h"
+#include "ios/chrome/browser/browser_state/chrome_browser_state_forward.h"
 
 namespace invalidation {
 class ProfileInvalidationProvider;
 }
 
-namespace ios {
-class ChromeBrowserState;
-}
-
 namespace user_prefs {
 class PrefRegistrySyncable;
 }

ios/chrome/browser/invalidation/ios_chrome_profile_invalidation_provider_factory.h

@@ -10,15 +10,12 @@
 #include "base/macros.h"
 #include "base/no_destructor.h"
 #include "components/keyed_service/ios/browser_state_keyed_service_factory.h"
+#include "ios/chrome/browser/browser_state/chrome_browser_state_forward.h"
 
 namespace invalidation {
 class ProfileInvalidationProvider;
 }
 
-namespace ios {
-class ChromeBrowserState;
-}
-
 // A BrowserContextKeyedServiceFactory to construct InvalidationServices wrapped
 // in ProfileInvalidationProviders.
 class IOSChromeProfileInvalidationProviderFactory