[ios] Removed User Action reporting from CRWSessionController.

ios/web/navigation/crw_session_controller.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/web/navigation/crw_session_controller.h"
 
 #include <stddef.h>
 
 #include <algorithm>
 #include <utility>
 #include <vector>
 
 #include "base/format_macros.h"
 #include "base/logging.h"
 #import "base/mac/foundation_util.h"
 #import "base/mac/scoped_nsobject.h"
-#include "base/metrics/user_metrics.h"
-#include "base/metrics/user_metrics_action.h"
 #include "base/strings/sys_string_conversions.h"
 #import "ios/web/history_state_util.h"
 #import "ios/web/navigation/crw_session_certificate_policy_manager.h"
 #import "ios/web/navigation/crw_session_controller+private_constructors.h"
 #import "ios/web/navigation/crw_session_entry.h"
 #include "ios/web/navigation/navigation_item_impl.h"
 #import "ios/web/navigation/navigation_manager_facade_delegate.h"
 #import "ios/web/navigation/navigation_manager_impl.h"
 #include "ios/web/navigation/time_smoother.h"
 #include "ios/web/public/browser_state.h"
 #include "ios/web/public/browser_url_rewriter.h"
 #include "ios/web/public/referrer.h"
 #include "ios/web/public/ssl_status.h"
 
 #if !defined(__has_feature) || !__has_feature(objc_arc)
 #error "This file requires ARC support."
 #endif
 
-using base::UserMetricsAction;
-
 namespace {
 NSString* const kCertificatePolicyManagerKey = @"certificatePolicyManager";
 NSString* const kCurrentNavigationIndexKey = @"currentNavigationIndex";
 NSString* const kEntriesKey = @"entries";
 NSString* const kLastVisitedTimestampKey = @"lastVisitedTimestamp";
 NSString* const kOpenerIdKey = @"openerId";
 NSString* const kOpenedByDOMKey = @"openedByDOM";
 NSString* const kOpenerNavigationIndexKey = @"openerNavigationIndex";
 NSString* const kPreviousNavigationIndexKey = @"previousNavigationIndex";
 NSString* const kTabIdKey = @"tabId";
@@ skipping 578 matching lines @@
     [self goToEntry:_entries[newNavigationIndex]];
   }
 }
 
 - (void)goToEntry:(CRWSessionEntry*)entry {
   DCHECK(entry);
   if (![_entries containsObject:entry])
     return;
 
   NSInteger newNavigationIndex = [_entries indexOfObject:entry];
-  NSInteger delta = newNavigationIndex - _currentNavigationIndex;
-  if (delta < 0) {
-    for (int i = delta; i < 0; i++) {
-      base::RecordAction(UserMetricsAction("Back"));
-    }
+  if (newNavigationIndex < _currentNavigationIndex) {
+    // Going back.
     [self discardNonCommittedEntries];
-  } else if (0 < delta) {
-    for (int i = 0; i < delta; i++) {
-      base::RecordAction(UserMetricsAction("Forward"));
-    }
+  } else if (_currentNavigationIndex < newNavigationIndex) {
+    // Going forward.
     [self discardTransientEntry];
   } else {
-    // delta is 0, no need to change current navigation index.
+    // |delta| is 0, no need to change current navigation index.
     return;
   }
 
   _previousNavigationIndex = _currentNavigationIndex;
   _currentNavigationIndex = newNavigationIndex;
 }
 
 - (void)removeEntryAtIndex:(NSInteger)index {
   DCHECK(index < static_cast<NSInteger>([_entries count]));
   DCHECK(index != _currentNavigationIndex);
@@ skipping 204 matching lines @@
   item->set_is_renderer_initiated(rendererInitiated);
   return [[CRWSessionEntry alloc] initWithNavigationItem:std::move(item)];
 }
 
 - (BOOL)isRedirectTransitionForEntryAtIndex:(NSInteger)index {
   ui::PageTransition transition = [self transitionForIndex:index];
   return (transition & ui::PAGE_TRANSITION_IS_REDIRECT_MASK) ? YES : NO;
 }
 
 @end