[ios] Fix uses of ios::ChromeBrowserState in /ios/chrome/browser/net

The ChromeBrowserState has been moved from the "ios" namespace
to the global namespace by http://crrev.com/c/2014913. Fix the
uses from ios::ChromeBrowserState to ChromeBrowserState.

Also remove includes of chrome_browser_state_forward.h and use
a simple forward declaration instead (since the old name is no
longer necessary).

This CL was uploaded by git cl split.

R=droger@chromium.org

Bug: 1042208
Change-Id: I77d72b14b9e11984192dd9ecb736b39ba41a02a0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2014939Reviewed-by: David Roger <droger@chromium.org>
Commit-Queue: Sylvain Defresne <sdefresne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#734912}

ios/chrome/browser/net/cookie_util.h

@@ -9,9 +9,10 @@
 
 #include "base/files/file_path.h"
 #include "base/memory/ref_counted.h"
-#include "ios/chrome/browser/browser_state/chrome_browser_state_forward.h"
 #include "net/cookies/canonical_cookie.h"
 
+class ChromeBrowserState;
+
 namespace net {
 class CookieCryptoDelegate;
 class CookieStore;
@@ -82,7 +83,7 @@ std::unique_ptr<net::CookieStore> CreateCookieStore(
 bool ShouldClearSessionCookies();
 
 // Clears the session cookies for |browser_state|.
-void ClearSessionCookies(ios::ChromeBrowserState* browser_state);
+void ClearSessionCookies(ChromeBrowserState* browser_state);
 
 }  // namespace cookie_util
 

ios/chrome/browser/net/cookie_util.mm

@@ -120,7 +120,7 @@ bool ShouldClearSessionCookies() {
 }
 
 // Clears the session cookies for |profile|.
-void ClearSessionCookies(ios::ChromeBrowserState* browser_state) {
+void ClearSessionCookies(ChromeBrowserState* browser_state) {
   scoped_refptr<net::URLRequestContextGetter> getter =
       browser_state->GetRequestContext();
   base::PostTask(FROM_HERE, {web::WebThread::IO}, base::BindOnce(^{