[Cleanup] Fix pronouns in comments.

chrome/browser/ui/cocoa/browser_window_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 "chrome/browser/ui/cocoa/browser_window_controller.h"
 
 #include <cmath>
 #include <numeric>
 
 #include "base/command_line.h"
@@ skipping 1777 matching lines @@
 }
 
 - (void)showTranslateBubbleForWebContents:(content::WebContents*)contents
                                      step:(translate::TranslateStep)step
                                 errorType:(translate::TranslateErrors::Type)
                                 errorType {
   // TODO(hajimehoshi): The similar logic exists at TranslateBubbleView::
   // ShowBubble. This should be unified.
   if (translateBubbleController_) {
     // When the user reads the advanced setting panel, the bubble should not be
-    // changed because he/she is focusing on the bubble.
+    // changed because they are focusing on the bubble.
     if (translateBubbleController_.webContents == contents &&
         translateBubbleController_.model->GetViewState() ==
         TranslateBubbleModel::VIEW_STATE_ADVANCED) {
       return;
     }
     if (step != translate::TRANSLATE_STEP_TRANSLATE_ERROR) {
       TranslateBubbleModel::ViewState viewState =
           TranslateBubbleModelImpl::TranslateStepToViewState(step);
       [translateBubbleController_ switchView:viewState];
     } else {
@@ skipping 422 matching lines @@
 
 - (BOOL)supportsBookmarkBar {
   return [self supportsWindowFeature:Browser::FEATURE_BOOKMARKBAR];
 }
 
 - (BOOL)isTabbedWindow {
   return browser_->is_type_tabbed();
 }
 
 @end  // @implementation BrowserWindowController(WindowType)