Remove refcounting from SavePackage.

content/browser/download/save_package.cc

Index: content/browser/download/save_package.cc
diff --git a/content/browser/download/save_package.cc b/content/browser/download/save_package.cc
index 7704eb4aae239d3bb53cf152caedcd28912f8e29..7bf3bd24041a133f51638e3a293f916e3c398eb5 100644
--- a/content/browser/download/save_package.cc
+++ b/content/browser/download/save_package.cc
@@ -342,7 +342,7 @@ void SavePackage::InitWithDownloadItem(
     MHTMLGenerationParams mhtml_generation_params(saved_main_file_path_);
     web_contents()->GenerateMHTML(
         mhtml_generation_params,
-        base::Bind(&SavePackage::OnMHTMLGenerated, this));
+        base::Bind(&SavePackage::OnMHTMLGenerated, Unretained(this)));
   } else {
     DCHECK_EQ(SAVE_PAGE_TYPE_AS_ONLY_HTML, save_type_);
     wait_state_ = NET_FILES;
@@ -383,7 +383,8 @@ void SavePackage::OnMHTMLGenerated(int64_t size) {
   }
 
   if (download_manager_->GetDelegate()->ShouldCompleteDownload(
-          download_, base::Bind(&SavePackage::Finish, this))) {
+          download_,
+          base::Bind(&SavePackage::Finish, base::Unretained(this)))) {
     Finish();
   }
 }
@@ -1382,8 +1383,9 @@ void SavePackage::GetSaveInfo() {
   std::string mime_type = web_contents()->GetContentsMimeType();
   BrowserThread::PostTask(
       BrowserThread::FILE, FROM_HERE,
-      base::Bind(&SavePackage::CreateDirectoryOnFileThread, this,
-          website_save_dir, download_save_dir, skip_dir_check, mime_type));
+      base::Bind(&SavePackage::CreateDirectoryOnFileThread,
+                 base::Unretained(this), website_save_dir, download_save_dir,
+                 skip_dir_check, mime_type));
 }
 
 void SavePackage::CreateDirectoryOnFileThread(
@@ -1430,8 +1432,8 @@ void SavePackage::CreateDirectoryOnFileThread(
 
   BrowserThread::PostTask(
       BrowserThread::UI, FROM_HERE,
-      base::Bind(&SavePackage::ContinueGetSaveInfo, this, save_dir,
-                 can_save_as_complete));
+      base::Bind(&SavePackage::ContinueGetSaveInfo, base::Unretained(this),
+                 save_dir, can_save_as_complete));
 }
 
 void SavePackage::ContinueGetSaveInfo(const base::FilePath& suggested_path,