[ios] Moves find-in-page code out of Tab and into FindTabHelper.

ios/chrome/browser/tabs/tab.mm

Index: ios/chrome/browser/tabs/tab.mm
diff --git a/ios/chrome/browser/tabs/tab.mm b/ios/chrome/browser/tabs/tab.mm
index 36ff77d9cea55717e0d69db7d33c17b0e45a309a..6ba09b3b8f2b3b816d255ab940c83ec2bfb70c56 100644
--- a/ios/chrome/browser/tabs/tab.mm
+++ b/ios/chrome/browser/tabs/tab.mm
@@ -63,6 +63,7 @@
 #include "ios/chrome/browser/experimental_flags.h"
 #include "ios/chrome/browser/favicon/favicon_service_factory.h"
 #import "ios/chrome/browser/find_in_page/find_in_page_controller.h"
+#import "ios/chrome/browser/find_in_page/find_tab_helper.h"
 #import "ios/chrome/browser/geolocation/omnibox_geolocation_controller.h"
 #include "ios/chrome/browser/history/history_service_factory.h"
 #include "ios/chrome/browser/history/top_sites_factory.h"
@@ -273,9 +274,6 @@ enum class RendererTerminationTabState {
   // Handles autofill.
   base::scoped_nsobject<AutofillController> autofillController_;
 
-  // Handles find on page.
-  base::scoped_nsobject<FindInPageController> findInPageController_;
-
   // Handles GAL infobar on web pages.
   base::scoped_nsobject<NativeAppNavigationController>
       nativeAppNavigationController_;
@@ -537,10 +535,6 @@ void TabInfoBarObserver::OnInfoBarReplaced(infobars::InfoBar* old_infobar,
         initWithSnapshotManager:snapshotManager_
                             tab:self]);
 
-    findInPageController_.reset([[FindInPageController alloc]
-        initWithWebState:self.webState
-                delegate:self]);
-
     [self initNativeAppNavigationController];
     // IOSChromeSessionTabHelper comes first because it sets up the tab ID, and
     // other helpers may rely on that.
@@ -553,6 +547,7 @@ void TabInfoBarObserver::OnInfoBarReplaced(infobars::InfoBar* old_infobar,
     IOSSecurityStateTabHelper::CreateForWebState(self.webState);
     RepostFormTabHelper::CreateForWebState(self.webState);
     BlockedPopupTabHelper::CreateForWebState(self.webState);
+    FindTabHelper::CreateForWebState(self.webState, self);
 
     if (reading_list::switches::IsReadingListEnabled()) {
       ReadingListModel* model =
@@ -1181,9 +1176,6 @@ void TabInfoBarObserver::OnInfoBarReplaced(infobars::InfoBar* old_infobar,
 
   [[NSNotificationCenter defaultCenter] removeObserver:self];
 
-  [findInPageController_ detachFromWebState];
-  findInPageController_.reset();
-
   [passwordController_ detach];
   passwordController_.reset();
   tabInfoBarObserver_.reset();
@@ -1686,7 +1678,6 @@ void TabInfoBarObserver::OnInfoBarReplaced(infobars::InfoBar* old_infobar,
   // TODO(crbug.com/381201): Move this call there once that bug is fixed so that
   // |disableFullScreen| is called only from one place.
   [fullScreenController_ disableFullScreen];
-  [findInPageController_ disableFindInPageWithCompletionHandler:nil];
   GURL lastCommittedURL = webState->GetLastCommittedURL();
   [autoReloadBridge_ loadStartedForURL:lastCommittedURL];
 
@@ -2172,10 +2163,6 @@ void TabInfoBarObserver::OnInfoBarReplaced(infobars::InfoBar* old_infobar,
   }
 }
 
-- (FindInPageController*)findInPageController {
-  return findInPageController_;
-}
-
 - (NativeAppNavigationController*)nativeAppNavigationController {
   return nativeAppNavigationController_;
 }
@@ -2248,7 +2235,6 @@ void TabInfoBarObserver::OnInfoBarReplaced(infobars::InfoBar* old_infobar,
   // Start observing the new web controller's InfoBarManager and FaviconDriver.
   [self setShouldObserveInfoBarManager:YES];
   [self setShouldObserveFaviconChanges:YES];
-  findInPageController_.reset();
 }
 
 - (void)replaceExternalAppLauncher:(id)externalAppLauncher {