Stop using GetDefaultProfile() in Chrome OS implementation of platform_util::OpenExternal()

chrome/browser/platform_util_mac.mm

Index: chrome/browser/platform_util_mac.mm
diff --git a/chrome/browser/platform_util_mac.mm b/chrome/browser/platform_util_mac.mm
index fad64e6c20db2c38894ae51bdc38e29b0f4d267c..674151939aeda660607b5721d72b185086a71565 100644
--- a/chrome/browser/platform_util_mac.mm
+++ b/chrome/browser/platform_util_mac.mm
@@ -122,7 +122,7 @@ void OpenItem(const base::FilePath& full_path) {
   }
 }
 
-void OpenExternal(const GURL& url) {
+void OpenExternal(Profile* profile, const GURL& url) {
   DCHECK([NSThread isMainThread]);
   NSString* url_string = base::SysUTF8ToNSString(url.spec());
   NSURL* ns_url = [NSURL URLWithString:url_string];