Make the manifest_ member of Extension into a scoped_ptr.

chrome/common/extensions/extension.cc

Index: chrome/common/extensions/extension.cc
diff --git a/chrome/common/extensions/extension.cc b/chrome/common/extensions/extension.cc
index 2427b8d532de81c1c3a7716c883a0ca49abbae88..70f09f50b4559b942b689452d3f7e72dc96f60b8 100644
--- a/chrome/common/extensions/extension.cc
+++ b/chrome/common/extensions/extension.cc
@@ -1293,7 +1293,7 @@ bool Extension::LoadLaunchContainer(string16* error) {
       launch_container_ == extension_misc::LAUNCH_WINDOW;
 
   // Validate the container width if present.
-  if (!ReadLaunchDimension(manifest_,
+  if (!ReadLaunchDimension(manifest_.get(),
                            keys::kLaunchWidth,
                            &launch_width_,
                            can_specify_initial_size,
@@ -1301,7 +1301,7 @@ bool Extension::LoadLaunchContainer(string16* error) {
       return false;
 
   // Validate container height if present.
-  if (!ReadLaunchDimension(manifest_,
+  if (!ReadLaunchDimension(manifest_.get(),
                            keys::kLaunchHeight,
                            &launch_height_,
                            can_specify_initial_size,
@@ -2925,8 +2925,6 @@ Extension::Extension(const FilePath& path,
 }
 
 Extension::~Extension() {
-  if (manifest_)
-    delete manifest_;
 }
 
 ExtensionResource Extension::GetResource(