Created a DownloadManager interface, for use in unit tests..

chrome/browser/ui/webui/downloads_dom_handler.cc

Index: chrome/browser/ui/webui/downloads_dom_handler.cc
diff --git a/chrome/browser/ui/webui/downloads_dom_handler.cc b/chrome/browser/ui/webui/downloads_dom_handler.cc
index f707ce2a1042a7351bbbdc142548aa98b4515753..fb6c08a5550d0391bb6ac434e9d1a556683a4441 100644
--- a/chrome/browser/ui/webui/downloads_dom_handler.cc
+++ b/chrome/browser/ui/webui/downloads_dom_handler.cc
@@ -124,7 +124,7 @@ DownloadsDOMHandler::DownloadsDOMHandler(DownloadManager* dlm)
       download_manager_(dlm),
       callback_factory_(ALLOW_THIS_IN_INITIALIZER_LIST(this)) {
   // Create our fileicon data source.
-  Profile::FromBrowserContext(dlm->browser_context())->
+  Profile::FromBrowserContext(dlm->BrowserContext())->
       GetChromeURLDataManager()->AddDataSource(
 #if defined(OS_CHROMEOS)
       new FileIconSourceCros());
@@ -144,7 +144,7 @@ void DownloadsDOMHandler::Init() {
   download_manager_->AddObserver(this);
 
   Profile* profile =
-      Profile::FromBrowserContext(download_manager_->browser_context());
+      Profile::FromBrowserContext(download_manager_->BrowserContext());
   Profile* original_profile = profile->GetOriginalProfile();
   if (original_profile != profile) {
     original_download_manager_observer_.reset(
@@ -225,7 +225,7 @@ void DownloadsDOMHandler::ModelChanged() {
                                      &download_items_);
   // If we have a parent profile, let it add its downloads to the results.
   Profile* profile =
-      Profile::FromBrowserContext(download_manager_->browser_context());
+      Profile::FromBrowserContext(download_manager_->BrowserContext());
   if (profile->GetOriginalProfile() != profile) {
     DownloadServiceFactory::GetForProfile(
         profile->GetOriginalProfile())->GetDownloadManager()->SearchDownloads(
@@ -346,7 +346,7 @@ void DownloadsDOMHandler::HandleClearAll(const ListValue* args) {
   download_manager_->RemoveAllDownloads();
 
   Profile* profile =
-      Profile::FromBrowserContext(download_manager_->browser_context());
+      Profile::FromBrowserContext(download_manager_->BrowserContext());
   // If this is an incognito downloader, clear All should clear main download
   // manager as well.
   if (profile->GetOriginalProfile() != profile)