Fix some issues with extensions:

chrome/browser/extensions/extensions_service.cc

Index: chrome/browser/extensions/extensions_service.cc
diff --git a/chrome/browser/extensions/extensions_service.cc b/chrome/browser/extensions/extensions_service.cc
index 3259c113e2fa701c980d73aa7ed6906f9932355e..9c509d40385920733bf5414045a1b77f19354864 100644
--- a/chrome/browser/extensions/extensions_service.cc
+++ b/chrome/browser/extensions/extensions_service.cc
@@ -975,6 +975,11 @@ void ExtensionsService::OnExtensionInstalled(Extension* extension,
   extension_prefs_->OnExtensionInstalled(
       extension, initial_state, initial_enable_incognito);
 
+  // Unpacked extensions start off with file access since they are a developer
+  // feature.
+  if (extension->location() == Extension::LOAD)
+    extension_prefs_->SetAllowFileAccess(extension->id(), true);
+
   // If the extension is a theme, tell the profile (and therefore ThemeProvider)
   // to apply it.
   if (extension->is_theme()) {