Convert WindowOpenDisposition to an enum class.

content/public/browser/web_contents_delegate.cc

Index: content/public/browser/web_contents_delegate.cc
diff --git a/content/public/browser/web_contents_delegate.cc b/content/public/browser/web_contents_delegate.cc
index df973484d0d98a93526ab6b06869e9c4a28a570b..74e59b1a195281723c21f9992a8d7e1396eafed4 100644
--- a/content/public/browser/web_contents_delegate.cc
+++ b/content/public/browser/web_contents_delegate.cc
@@ -96,9 +96,10 @@ void WebContentsDelegate::ViewSourceForTab(WebContents* source,
   // It suffers from http://crbug.com/523 and that is why browser overrides
   // it with proper implementation.
   GURL url = GURL(kViewSourceScheme + std::string(":") + page_url.spec());
-  OpenURLFromTab(source, OpenURLParams(url, Referrer(),
-                                       NEW_FOREGROUND_TAB,
-                                       ui::PAGE_TRANSITION_LINK, false));
+  OpenURLFromTab(
+      source,
+      OpenURLParams(url, Referrer(), WindowOpenDisposition::NEW_FOREGROUND_TAB,
+                    ui::PAGE_TRANSITION_LINK, false));
 }
 
 void WebContentsDelegate::ViewSourceForFrame(WebContents* source,
@@ -106,9 +107,10 @@ void WebContentsDelegate::ViewSourceForFrame(WebContents* source,
                                              const PageState& page_state) {
   // Same as ViewSourceForTab, but for given subframe.
   GURL url = GURL(kViewSourceScheme + std::string(":") + frame_url.spec());
-  OpenURLFromTab(source, OpenURLParams(url, Referrer(),
-                                       NEW_FOREGROUND_TAB,
-                                       ui::PAGE_TRANSITION_LINK, false));
+  OpenURLFromTab(
+      source,
+      OpenURLParams(url, Referrer(), WindowOpenDisposition::NEW_FOREGROUND_TAB,
+                    ui::PAGE_TRANSITION_LINK, false));
 }
 
 bool WebContentsDelegate::PreHandleKeyboardEvent(