Make FileSystemContext respect StoragePartitions. filesystem:// urls will be properly isolated

chrome/browser/extensions/extension_service.cc

Index: chrome/browser/extensions/extension_service.cc
diff --git a/chrome/browser/extensions/extension_service.cc b/chrome/browser/extensions/extension_service.cc
index 6613da2d84bb8ba8303cffc5cb6b7777e86fdbad..22b8576664f67a57b8bd35705a3430950f528d4c 100644
--- a/chrome/browser/extensions/extension_service.cc
+++ b/chrome/browser/extensions/extension_service.cc
@@ -120,6 +120,7 @@
 #include "chrome/browser/chromeos/extensions/media_player_event_router.h"
 #include "chrome/browser/chromeos/input_method/input_method_manager.h"
 #include "chrome/browser/extensions/api/input_ime/input_ime_api.h"
+#include "content/public/browser/storage_partition.h"
 #include "webkit/fileapi/file_system_context.h"
 #include "webkit/fileapi/file_system_mount_point_provider.h"
 #endif
@@ -1097,11 +1098,12 @@ void ExtensionService::NotifyExtensionUnloaded(
       profile_, extension->GetChromeURLOverrides());
 
 #if defined(OS_CHROMEOS)
-    // Revoke external file access to
-  if (BrowserContext::GetFileSystemContext(profile_) &&
-      BrowserContext::GetFileSystemContext(profile_)->external_provider()) {
-    BrowserContext::GetFileSystemContext(profile_)->external_provider()->
-        RevokeAccessForExtension(extension->id());
+  // Revoke external file access to third party extensions.
+  fileapi::FileSystemContext* context =
+      BrowserContext::GetDefaultStoragePartition(profile_)->
+          GetFileSystemContext();
+  if (context && context->external_provider()) {
+    context->external_provider()->RevokeAccessForExtension(extension->id());
   }
 
   if (extension->input_components().size() > 0) {