Remove unneeded IconLoader::image_

chrome/browser/icon_loader_auralinux.cc

Index: chrome/browser/icon_loader_auralinux.cc
diff --git a/chrome/browser/icon_loader_auralinux.cc b/chrome/browser/icon_loader_auralinux.cc
index 449d05771d76648cce40da5091ee722085971f86..a1c098b9ed32fb43012b63389a1b44c485138625 100644
--- a/chrome/browser/icon_loader_auralinux.cc
+++ b/chrome/browser/icon_loader_auralinux.cc
@@ -5,6 +5,7 @@
 #include "chrome/browser/icon_loader.h"
 
 #include "base/bind.h"
+#include "base/memory/ptr_util.h"
 #include "base/message_loop/message_loop.h"
 #include "base/nix/mime_util_xdg.h"
 #include "ui/views/linux_ui/linux_ui.h"
@@ -38,14 +39,16 @@ void IconLoader::ReadIcon() {
       NOTREACHED();
   }
 
+  std::unique_ptr<gfx::Image> image;
   views::LinuxUI* ui = views::LinuxUI::instance();
   if (ui) {
-    gfx::Image image = ui->GetIconForContentType(group_, size_pixels);
-    if (!image.IsEmpty())
-      image_.reset(new gfx::Image(image));
+    image = base::MakeUnique<gfx::Image>(
+        ui->GetIconForContentType(group_, size_pixels));
+    if (image->IsEmpty())
+      image = nullptr;
   }
 
   target_task_runner_->PostTask(
-      FROM_HERE, base::Bind(callback_, base::Passed(&image_), group_));
+      FROM_HERE, base::Bind(callback_, base::Passed(&image), group_));
   delete this;
 }