[ios] Adds support for Find in Page to the new architecture.

ios/shared/chrome/browser/ui/browser_list/browser_web_state_list_delegate.mm

Index: ios/shared/chrome/browser/ui/browser_list/browser_web_state_list_delegate.mm
diff --git a/ios/shared/chrome/browser/ui/browser_list/browser_web_state_list_delegate.mm b/ios/shared/chrome/browser/ui/browser_list/browser_web_state_list_delegate.mm
index 2b166dd87e7fa1423a9cae864a92baa7eb6e6225..d2a102b807b0c2c274932bb43642bc9613451132 100644
--- a/ios/shared/chrome/browser/ui/browser_list/browser_web_state_list_delegate.mm
+++ b/ios/shared/chrome/browser/ui/browser_list/browser_web_state_list_delegate.mm
@@ -5,6 +5,7 @@
 #import "ios/shared/chrome/browser/ui/browser_list/browser_web_state_list_delegate.h"
 
 #include "base/logging.h"
+#import "ios/chrome/browser/find_in_page/find_tab_helper.h"
 #import "ios/chrome/browser/sessions/ios_chrome_session_tab_helper.h"
 #import "ios/chrome/browser/ssl/ios_security_state_tab_helper.h"
 
@@ -20,6 +21,7 @@ BrowserWebStateListDelegate::BrowserWebStateListDelegate(Browser* browser)
 BrowserWebStateListDelegate::~BrowserWebStateListDelegate() = default;
 
 void BrowserWebStateListDelegate::WillAddWebState(web::WebState* web_state) {
+  FindTabHelper::CreateForWebState(web_state, nil);
   IOSChromeSessionTabHelper::CreateForWebState(web_state);
   IOSSecurityStateTabHelper::CreateForWebState(web_state);
 }