Clear disk cache when the cache is not initialized

BUG=24765
TEST=unit test, clear browsing data and the cache, media cache will
     be cleared even if a media object was not loaded.

Since the disk cache backend in HttpCache is lazily initialized, clearing
the cache before it receives the first transaction would have no effect.
So initialize the disk cache explicitly when we clear the cache.

Review URL: http://codereview.chromium.org/378015

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@31361 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 4 insertions, 6 deletions

diff --git a/chrome/browser/browsing_data_remover.cc b/chrome/browser/browsing_data_remover.cc
index 0a646fa..4477ce7 100644
--- a/chrome/browser/browsing_data_remover.cc
+++ b/chrome/browser/browsing_data_remover.cc
@@ -240,10 +240,9 @@ void BrowsingDataRemover::ClearCacheOnIOThread(
   // Get a pointer to the cache.
   net::HttpTransactionFactory* factory =
       main_context_getter->GetURLRequestContext()->http_transaction_factory();
-  disk_cache::Backend* cache = factory->GetCache()->disk_cache();
+  disk_cache::Backend* cache = factory->GetCache()->GetBackend();
 
-  // |cache| can be null since it is lazily initialized, in this case we do
-  // nothing.
+  // |cache| can be null if it cannot be initialized.
   if (cache) {
     if (delete_begin.is_null())
       cache->DoomAllEntries();
@@ -254,10 +253,9 @@ void BrowsingDataRemover::ClearCacheOnIOThread(
   // Get a pointer to the media cache.
   factory = media_context_getter->GetURLRequestContext()->
       http_transaction_factory();
-  cache = factory->GetCache()->disk_cache();
+  cache = factory->GetCache()->GetBackend();
 
-  // |cache| can be null since it is lazily initialized, in this case we do
-  // nothing.
+  // |cache| can be null if it cannot be initialized.
   if (cache) {
     if (delete_begin.is_null())
       cache->DoomAllEntries();