[ios] Hoists the FindInPageModel up into the controller.

ios/chrome/browser/find_in_page/js_findinpage_manager.mm

 // 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.
 
 #import "ios/chrome/browser/find_in_page/js_findinpage_manager.h"
 
 #include <memory>
 #include <string>
 
 #include "base/json/json_reader.h"
@@ skipping 62 matching lines @@
 - (void)moveHighlightByEvaluatingJavaScript:(NSString*)script
                           completionHandler:
                               (void (^)(CGPoint))completionHandler;
 // Updates the current match index and its found position in the model.
 - (void)updateIndex:(NSInteger)index atPoint:(CGPoint)point;
 @end
 
 @implementation JsFindinpageManager
 @synthesize findInPageModel = _findInPageModel;
 
-- (FindInPageModel*)findInPageModel {
-  if (!_findInPageModel)
-    _findInPageModel = [[FindInPageModel alloc] init];
-  return _findInPageModel;
-}
-
 - (void)setWidth:(CGFloat)width height:(CGFloat)height {
   NSString* javaScript =
       [NSString stringWithFormat:kFindInPageInit, width, height];
   [self executeJavaScript:javaScript completionHandler:nil];
 }
 
 - (void)findString:(NSString*)query
     completionHandler:(void (^)(BOOL, CGPoint))completionHandler {
   DCHECK(completionHandler);
   // Save the query in the model before searching.
@@ skipping 160 matching lines @@
 }
 
 #pragma mark -
 #pragma mark ProtectedMethods
 
 - (NSString*)scriptPath {
   return @"find_in_page";
 }
 
 @end