Support restricting browsing data removal for downloads by origin.

content/browser/browser_context.cc

Index: content/browser/browser_context.cc
diff --git a/content/browser/browser_context.cc b/content/browser/browser_context.cc
index a7394834cc21304a26293c7e56cc12a46e8e13ff..25ffaf2d835cb527c2b10d10cb43f773d4283433 100644
--- a/content/browser/browser_context.cc
+++ b/content/browser/browser_context.cc
@@ -91,6 +91,13 @@ void ShutdownServiceWorkerContext(StoragePartition* partition) {
   wrapper->process_manager()->Shutdown();
 }
 
+void SetDownloadManager(BrowserContext* context,
+                        content::DownloadManager* download_manager) {
+  DCHECK_CURRENTLY_ON(BrowserThread::UI);
+  DCHECK(download_manager);
+  context->SetUserData(kDownloadManagerKeyName, download_manager);
+}
+
 }  // namespace
 
 // static
@@ -121,9 +128,7 @@ DownloadManager* BrowserContext::GetDownloadManager(
         new DownloadManagerImpl(
             GetContentClient()->browser()->GetNetLog(), context);
 
-    context->SetUserData(
-        kDownloadManagerKeyName,
-        download_manager);
+    SetDownloadManager(context, download_manager);
     download_manager->SetDelegate(context->GetDownloadManagerDelegate());
   }
 
@@ -307,6 +312,12 @@ void BrowserContext::SaveSessionState(BrowserContext* browser_context) {
   }
 }
 
+void BrowserContext::SetDownloadManagerForTesting(
+    BrowserContext* browser_context,
+    DownloadManager* download_manager) {
+  SetDownloadManager(browser_context, download_manager);
+}
+
 #endif  // !OS_IOS
 
 BrowserContext::~BrowserContext() {