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

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=justincohen@chromium.org

Bug: 1042208
Change-Id: I0ef69eaf7d6bbd882e4cab49441f092e6fb2fa68
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2017524Reviewed-by: Justin Cohen <justincohen@chromium.org>
Commit-Queue: Sylvain Defresne <sdefresne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#735280}

ios/chrome/browser/ui/ntp/new_tab_page_coordinator.h

@@ -25,13 +25,12 @@ class WebState;
     : ChromeCoordinator <LogoAnimationControllerOwnerOwner>
 
 // Initializes this Coordinator with its |browserState|.
-- (instancetype)initWithBrowserState:(ios::ChromeBrowserState*)browserState
+- (instancetype)initWithBrowserState:(ChromeBrowserState*)browserState
     NS_DESIGNATED_INITIALIZER;
 - (instancetype)initWithBaseViewController:(UIViewController*)viewController
     NS_UNAVAILABLE;
 - (instancetype)initWithBaseViewController:(UIViewController*)viewController
-                              browserState:
-                                  (ios::ChromeBrowserState*)browserState
+                              browserState:(ChromeBrowserState*)browserState
     NS_UNAVAILABLE;
 - (instancetype)initWithBaseViewController:(UIViewController*)viewController
                                    browser:(Browser*)browser NS_UNAVAILABLE;

ios/chrome/browser/ui/ntp/new_tab_page_coordinator.mm

@@ -35,7 +35,7 @@
 
 #pragma mark - ChromeCoordinator
 
-- (instancetype)initWithBrowserState:(ios::ChromeBrowserState*)browserState {
+- (instancetype)initWithBrowserState:(ChromeBrowserState*)browserState {
   return [super initWithBaseViewController:nil browserState:browserState];
 }
 

ios/chrome/browser/ui/ntp/new_tab_page_coordinator_unittest.mm

@@ -57,7 +57,7 @@ class NewTabPageCoordinatorTest : public PlatformTest {
 
   void CreateCoordinator(bool off_the_record) {
     if (off_the_record) {
-      ios::ChromeBrowserState* otr_state =
+      ChromeBrowserState* otr_state =
           browser_state_->GetOffTheRecordChromeBrowserState();
       coordinator_ =
           [[NewTabPageCoordinator alloc] initWithBrowserState:otr_state];