Move GuestViewBase::GetGuestPartitionConfigForSite to WebViewGuest.

chrome/browser/guest_view/web_view/web_view_guest.h

Index: chrome/browser/guest_view/web_view/web_view_guest.h
diff --git a/chrome/browser/guest_view/web_view/web_view_guest.h b/chrome/browser/guest_view/web_view/web_view_guest.h
index 87e26fe3b5749c3cd17646ad6b23a19ef465ecab..89031a7a3af7ae83b3199baf2664d55560bf2163 100644
--- a/chrome/browser/guest_view/web_view/web_view_guest.h
+++ b/chrome/browser/guest_view/web_view/web_view_guest.h
@@ -48,6 +48,18 @@ class WebViewGuest : public GuestView<WebViewGuest>,
                content::WebContents* guest_web_contents,
                const std::string& embedder_extension_id);
 
+  // For WebViewGuest, we create special guest processes, which host the
+  // tag content separately from the main application that embeds the tag.
+  // A <webview> can specify both the partition name and whether the storage
+  // for that partition should be persisted. Each tag gets a SiteInstance with
+  // a specially formatted URL, based on the application it is hosted by and
+  // the partition requested by it. The format for that URL is:
+  // chrome-guest://partition_domain/persist?partition_name
+  static bool GetGuestPartitionConfigForSite(const GURL& site,
+                                             std::string* partition_domain,
+                                             std::string* partition_name,
+                                             bool* in_memory);
+
   // Returns guestview::kInstanceIDNone if |contents| does not correspond to a
   // WebViewGuest.
   static int GetViewInstanceId(content::WebContents* contents);