[ios] Hoists the FindInPageModel up into the controller.

ios/chrome/browser/find_in_page/js_findinpage_manager.h

 // Copyright 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef IOS_CHROME_BROWSER_FIND_IN_PAGE_JS_FINDINPAGE_MANAGER_H_
 #define IOS_CHROME_BROWSER_FIND_IN_PAGE_JS_FINDINPAGE_MANAGER_H_
 
 #include <CoreGraphics/CGBase.h>
 #include <CoreGraphics/CGGeometry.h>
 
 #include "base/ios/block_types.h"
 #import "ios/web/public/web_state/js/crw_js_injection_manager.h"
 
 // Data from find in page.
 typedef struct FindInPageEntry {
   CGPoint point;    // Scroll offset required to center the highlighted item.
   NSInteger index;  // Currently higlighted search term.
 } FindInPageEntry;
 
 // Constant for "not found".
 extern FindInPageEntry FindInPageEntryZero;
 
 @class CRWJSInjectionReceiver;
 @class FindInPageModel;
 
 // Manager for the injection of the Find In Page JavaScript.
 @interface JsFindinpageManager : CRWJSInjectionManager
 
-// Find In Page model. TODO(justincohen) consider using find_tab_helper.cc.
-@property(strong, nonatomic, readonly) FindInPageModel* findInPageModel;
+// Find In Page model.
+@property(nonatomic, readwrite, strong) FindInPageModel* findInPageModel;

[rohitrao (ping after 24h), 2017/02/10 21:07:08]

This isn't created by the manager anymore, but I think it's ok for it to still
be a strong reference?

 
 // Sets the width and height of the window.
 - (void)setWidth:(CGFloat)width height:(CGFloat)height;
 
 // Runs injected JavaScript to find |query| string. Calls |completionHandler|
 // with YES if the find operation completed, it is called with NO otherwise.
 // If the find operation was successfiul the first match to scroll to is
 // also called with. If the |completionHandler| is called with NO, another
 // call to |pumpWithCompletionHandler:| is required. |completionHandler| cannot
 // be nil.
@@ skipping 15 matching lines @@
 // with the new scroll position passed in. The |completionHandler| can be nil.
 - (void)previousMatchWithCompletionHandler:(void (^)(CGPoint))completionHandler;
 
 // Stops find in page and calls |completionHandler| once find in page is
 // stopped. |completionHandler| cannot be nil.
 - (void)disableWithCompletionHandler:(ProceduralBlock)completionHandler;
 
 @end
 
 #endif  // IOS_CHROME_BROWSER_FIND_IN_PAGE_JS_FINDINPAGE_MANAGER_H_