[Cleanup] Fix pronouns in comments.

Replacing the unwieldy "he/she" with "they".

TBR=brettw@chromium.org
BUG=none

Review URL: https://codereview.chromium.org/1144413002

Cr-Commit-Position: refs/heads/master@{#330871}

chrome/browser/ui/cocoa/browser_window_controller.mm

@@ -1796,7 +1796,7 @@ using content::WebContents;
   // 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) {

chrome/browser/ui/views/translate/translate_bubble_view.cc

@@ -87,7 +87,7 @@ void TranslateBubbleView::ShowBubble(
     bool is_user_gesture) {
   if (translate_bubble_view_) {
     // 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 (translate_bubble_view_->web_contents() == web_contents &&
         translate_bubble_view_->model()->GetViewState() ==
         TranslateBubbleModel::VIEW_STATE_ADVANCED) {

components/translate/core/browser/translate_manager.cc

@@ -207,7 +207,7 @@ void TranslateManager::InitiateTranslation(const std::string& page_lang) {
   TranslateBrowserMetrics::ReportInitiationStatus(
       TranslateBrowserMetrics::INITIATION_STATUS_SHOW_INFOBAR);
 
-  // Prompts the user if he/she wants the page translated.
+  // Prompts the user if they want the page translated.
   translate_client_->ShowTranslateUI(translate::TRANSLATE_STEP_BEFORE_TRANSLATE,
                                      language_code,
                                      target_lang,