Remove DEFINE_WEB_STATE_USER_DATA_KEY macro.

This macro is a no-op and can can be safely removed.

Bug: 589840
Change-Id: If00faba34a0f10a3353bc2086329b1ba0c1a0901
Reviewed-on: https://chromium-review.googlesource.com/c/1355768Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Commit-Queue: Sylvain Defresne <sdefresne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#613025}

components/autofill/ios/form_util/form_activity_tab_helper.mm

@@ -16,8 +16,6 @@
 #error "This file requires ARC support."
 #endif
 
-DEFINE_WEB_STATE_USER_DATA_KEY(autofill::FormActivityTabHelper);
-
 namespace autofill {
 
 namespace {

components/favicon/ios/web_favicon_driver.mm

@@ -24,8 +24,6 @@
 #error "This file requires ARC support."
 #endif
 
-DEFINE_WEB_STATE_USER_DATA_KEY(favicon::WebFaviconDriver);
-
 // Callback for the download of favicon.
 using ImageDownloadCallback =
     base::Callback<void(int image_id,

components/history/ios/browser/web_state_top_sites_observer.mm

@@ -14,8 +14,6 @@
 #error "This file requires ARC support."
 #endif
 
-DEFINE_WEB_STATE_USER_DATA_KEY(history::WebStateTopSitesObserver);
-
 namespace history {
 
 // static

components/language/ios/browser/ios_language_detection_tab_helper.mm

@@ -7,8 +7,6 @@
 #include "components/language/core/browser/url_language_histogram.h"
 #include "components/translate/core/common/language_detection_details.h"
 
-DEFINE_WEB_STATE_USER_DATA_KEY(language::IOSLanguageDetectionTabHelper);
-
 namespace language {
 
 IOSLanguageDetectionTabHelper::IOSLanguageDetectionTabHelper(

ios/chrome/browser/sync/ios_chrome_synced_tab_delegate.mm

@@ -22,8 +22,6 @@
 
 using web::NavigationItem;
 
-DEFINE_WEB_STATE_USER_DATA_KEY(IOSChromeSyncedTabDelegate);
-
 namespace {
 
 // Helper to access the correct NavigationItem, accounting for pending entries.

ios/web/public/web_state/web_state_user_data.h

@@ -58,10 +58,6 @@ class WebStateUserData : public base::SupportsUserData::Data {
   }
 };
 
-// Macro previously used to define the UserDataKey().
-// TODO(crbug.com/589840): Remove this once all use have been deleted.
-#define DEFINE_WEB_STATE_USER_DATA_KEY(TYPE)
-
 }  // namespace web
 
 #endif  // IOS_WEB_PUBLIC_WEB_STATE_WEB_STATE_USER_DATA_H_