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

content/browser/plugin_process_host.cc

Index: content/browser/plugin_process_host.cc
===================================================================
--- content/browser/plugin_process_host.cc	(revision 147830)
+++ content/browser/plugin_process_host.cc	(working copy)
@@ -261,14 +261,17 @@
 #if defined(OS_POSIX)
   base::EnvironmentVector env;
 #if defined(OS_MACOSX) && !defined(__LP64__)
-  // Add our interposing library for Carbon. This is stripped back out in
-  // plugin_main.cc, so changes here should be reflected there.
-  std::string interpose_list(plugin_interpose_strings::kInterposeLibraryPath);
-  const char* existing_list =
-      getenv(plugin_interpose_strings::kDYLDInsertLibrariesKey);
-  if (existing_list) {
-    interpose_list.insert(0, ":");
-    interpose_list.insert(0, existing_list);
+  std::string interpose_list =
+      content::GetContentClient()->GetCarbonInterposePath();
+  if (!interpose_list.empty()) {
+    // Add our interposing library for Carbon. This is stripped back out in
+    // plugin_main.cc, so changes here should be reflected there.
+    const char* existing_list =
+        getenv(plugin_interpose_strings::kDYLDInsertLibrariesKey);
+    if (existing_list) {
+      interpose_list.insert(0, ":");
+      interpose_list.insert(0, existing_list);
+    }
   }
   env.push_back(std::pair<std::string, std::string>(
       plugin_interpose_strings::kDYLDInsertLibrariesKey,