Use the site engagement eviction policy for temporary storage eviction.

chrome/browser/chrome_content_browser_client.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_CHROME_CONTENT_BROWSER_CLIENT_H_
 #define CHROME_BROWSER_CHROME_CONTENT_BROWSER_CLIENT_H_
 
 #include <set>
 #include <string>
 #include <utility>
@@ skipping 223 matching lines @@
   ui::SelectFilePolicy* CreateSelectFilePolicy(
       content::WebContents* web_contents) override;
   void GetAdditionalAllowedSchemesForFileSystem(
       std::vector<std::string>* additional_schemes) override;
   void GetURLRequestAutoMountHandlers(
       std::vector<storage::URLRequestAutoMountHandler>* handlers) override;
   void GetAdditionalFileSystemBackends(
       content::BrowserContext* browser_context,
       const base::FilePath& storage_partition_path,
       ScopedVector<storage::FileSystemBackend>* additional_backends) override;
+  storage::QuotaEvictionPolicy* GetTemporaryStorageEvictionPolicy(
+      content::BrowserContext* browser_context) override;
   content::DevToolsManagerDelegate* GetDevToolsManagerDelegate() override;
   content::TracingDelegate* GetTracingDelegate() override;
   bool IsPluginAllowedToCallRequestOSFileHandle(
       content::BrowserContext* browser_context,
       const GURL& url) override;
   bool IsPluginAllowedToUseDevChannelAPIs(
       content::BrowserContext* browser_context,
       const GURL& url) override;
   void OverridePageVisibilityState(
       content::RenderFrameHost* render_frame_host,
@@ skipping 78 matching lines @@
   std::vector<ChromeContentBrowserClientParts*> extra_parts_;
 
   base::WeakPtrFactory<ChromeContentBrowserClient> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromeContentBrowserClient);
 };
 
 }  // namespace chrome
 
 #endif  // CHROME_BROWSER_CHROME_CONTENT_BROWSER_CLIENT_H_