No need for default_download_path_ member.

atom/browser/atom_browser_context.h

@@ -32,7 +32,7 @@ class AtomBrowserContext : public brightray::BrowserContext {
   content::DownloadManagerDelegate* GetDownloadManagerDelegate() override;
   content::BrowserPluginGuestManager* GetGuestManager() override;
 
-  // brightray::BrowserContext::
+  // brightray::BrowserContext:
   void RegisterPrefs(PrefRegistrySimple* pref_registry) override;
 
   AtomURLRequestJobFactory* job_factory() const { return job_factory_; }

atom/browser/atom_download_manager_delegate.cc

@@ -102,12 +102,12 @@ bool AtomDownloadManagerDelegate::DetermineDownloadTarget(
 
   AtomBrowserContext* browser_context = static_cast<AtomBrowserContext*>(
       download_manager_->GetBrowserContext());
-  default_download_path_ = browser_context->prefs()->GetFilePath(
+  base::FilePath default_download_path = browser_context->prefs()->GetFilePath(
       prefs::kDownloadDefaultDirectory);
   // If users didn't set download path, use 'Downloads' directory by default.
-  if (default_download_path_.empty()) {
+  if (default_download_path.empty()) {
     auto path = download_manager_->GetBrowserContext()->GetPath();
-    default_download_path_ = path.Append(FILE_PATH_LITERAL("Downloads"));
+    default_download_path = path.Append(FILE_PATH_LITERAL("Downloads"));
   }
 
   if (!download->GetForcedFilePath().empty()) {
@@ -131,7 +131,7 @@ bool AtomDownloadManagerDelegate::DetermineDownloadTarget(
                  download->GetContentDisposition(),
                  download->GetSuggestedFilename(),
                  download->GetMimeType(),
-                 default_download_path_,
+                 default_download_path,
                  download_path_callback));
   return true;
 }

atom/browser/atom_download_manager_delegate.h

@@ -47,7 +47,6 @@ class AtomDownloadManagerDelegate : public content::DownloadManagerDelegate {
 
  private:
   content::DownloadManager* download_manager_;
-  base::FilePath default_download_path_;
   base::WeakPtrFactory<AtomDownloadManagerDelegate> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(AtomDownloadManagerDelegate);