Get the path of the plugin interposing library from the embedder, since they're the ones who bundle…

content/public/common/content_client.h

Index: content/public/common/content_client.h
===================================================================
--- content/public/common/content_client.h	(revision 147830)
+++ content/public/common/content_client.h	(working copy)
@@ -139,6 +139,10 @@
   virtual bool GetSandboxProfileForSandboxType(
       int sandbox_type,
       int* sandbox_profile_resource_id) const;
+
+  // Gets the Carbon interposing path to give to DYLD. Returns an empty string
+  // if the embedder doesn't bundle it.
+  virtual std::string GetCarbonInterposePath() const;
 #endif
 
   void set_browser_for_testing(ContentBrowserClient* c) { browser_ = c; }