[iOS][web] Group public methods

This CL puts all the public methods together.
It also moves webState, webStateImpl and scrollPosition to private
properties.

Bug: 938255
Change-Id: Ic2b9870da254f538c201893dad87a99f4d18c216
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1503323
Commit-Queue: Gauthier Ambard <gambard@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#638099}

ios/web/web_state/ui/crw_web_controller.h

@@ -43,7 +43,6 @@ class GURL;
 
 namespace web {
 class NavigationItem;
-class WebState;
 class WebStateImpl;
 }
 
@@ -65,8 +64,6 @@ class WebStateImpl;
 @property(nonatomic, weak) id<CRWNativeContentProvider> nativeProvider;
 @property(nonatomic, weak) id<CRWSwipeRecognizerProvider>
     swipeRecognizerProvider;
-@property(nonatomic, readonly) web::WebState* webState;
-@property(nonatomic, readonly) web::WebStateImpl* webStateImpl;
 
 // The container view used to display content.  If the view has been purged due
 // to low memory, this will recreate it.
@@ -90,9 +87,6 @@ class WebStateImpl;
 // (nothing loaded) and 1.0 (fully loaded).
 @property(nonatomic, readonly) double loadingProgress;
 
-// Returns the x, y offset the content has been scrolled.
-@property(nonatomic, readonly) CGPoint scrollPosition;
-
 // YES if the web process backing WebView is believed to currently be crashed.
 @property(nonatomic, assign, getter=isWebProcessCrashed) BOOL webProcessCrashed;
 
@@ -154,9 +148,6 @@ class WebStateImpl;
 // navigation. |isRendererInitiated| is NO for browser-initiated navigation.
 - (void)reloadWithRendererInitiatedNavigation:(BOOL)isRendererInitiated;
 
-// Stops web view loading.
-- (void)stopLoading;
-
 // Loads the URL indicated by current session state.
 - (void)loadCurrentURLWithRendererInitiatedNavigation:(BOOL)rendererInitiated;
 
@@ -235,6 +226,9 @@ class WebStateImpl;
 
 @interface CRWWebController (UsedOnlyForTesting)  // Testing or internal API.
 
+@property(nonatomic, readonly) web::WebState* webState;
+@property(nonatomic, readonly) web::WebStateImpl* webStateImpl;
+
 // Returns whether the user is interacting with the page.
 @property(nonatomic, readonly) BOOL userIsInteracting;