[ios] Fix uses of ios::ChromeBrowserState in...

[ios] Fix uses of ios::ChromeBrowserState in /ios/chrome/browser/ui/browser_view/browser_view_controller_dependency_factory.mm

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=marq@chromium.org

Bug: 1042208
Change-Id: I5c3b376cf001f736937a45c92b9fa2754db64d32
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2017443Reviewed-by: Mark Cogan <marq@chromium.org>
Commit-Queue: Sylvain Defresne <sdefresne@chromium.org>
Auto-Submit: Sylvain Defresne <sdefresne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#735859}

ios/chrome/browser/ui/browser_view/browser_view_controller_dependency_factory.mm

@@ -17,11 +17,11 @@
 #endif
 
 @implementation BrowserViewControllerDependencyFactory {
-  ios::ChromeBrowserState* _browserState;
+  ChromeBrowserState* _browserState;
   WebStateList* _webStateList;
 }
 
-- (id)initWithBrowserState:(ios::ChromeBrowserState*)browserState
+- (id)initWithBrowserState:(ChromeBrowserState*)browserState
               webStateList:(WebStateList*)webStateList {
   self = [super init];
   if (self) {