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

chrome/browser/ui/apps/chrome_shell_window_delegate.cc

Index: chrome/browser/ui/apps/chrome_shell_window_delegate.cc
diff --git a/chrome/browser/ui/apps/chrome_shell_window_delegate.cc b/chrome/browser/ui/apps/chrome_shell_window_delegate.cc
index 188a66ad9d2d014ba0e5241045fa68cc2f90bc43..f30e5018313dfb62871040ab14a6d24391c3dd71 100644
--- a/chrome/browser/ui/apps/chrome_shell_window_delegate.cc
+++ b/chrome/browser/ui/apps/chrome_shell_window_delegate.cc
@@ -47,7 +47,10 @@ ShellWindowLinkDelegate::~ShellWindowLinkDelegate() {}
 content::WebContents* ShellWindowLinkDelegate::OpenURLFromTab(
     content::WebContents* source,
     const content::OpenURLParams& params) {
-  platform_util::OpenExternal(params.url);
+  if (source) {
+    platform_util::OpenExternal(
+        Profile::FromBrowserContext(source->GetBrowserContext()), params.url);
+  }
   delete source;
   return NULL;
 }