Let IndexedDBContextImpl create its own task runner

content/browser/indexed_db/indexed_db_quota_client.cc

Index: content/browser/indexed_db/indexed_db_quota_client.cc
diff --git a/content/browser/indexed_db/indexed_db_quota_client.cc b/content/browser/indexed_db/indexed_db_quota_client.cc
index c43d6721d766ecea2f7c837fe0530a8486cad732..3d50c3ad0971949be57a9cabe5746c1db43c0408 100644
--- a/content/browser/indexed_db/indexed_db_quota_client.cc
+++ b/content/browser/indexed_db/indexed_db_quota_client.cc
@@ -84,12 +84,6 @@ void IndexedDBQuotaClient::GetOriginUsage(const GURL& origin_url,
     return;
   }
 
-  // No task runner means unit test; no cleanup necessary.
-  if (!indexed_db_context_->TaskRunner()) {
-    callback.Run(0);
-    return;
-  }
-
   base::PostTaskAndReplyWithResult(
       indexed_db_context_->TaskRunner(), FROM_HERE,
       base::Bind(&GetOriginUsageOnIndexedDBThread,
@@ -109,12 +103,6 @@ void IndexedDBQuotaClient::GetOriginsForType(
     return;
   }
 
-  // No task runner means unit test; no cleanup necessary.
-  if (!indexed_db_context_->TaskRunner()) {
-    callback.Run(std::set<GURL>());
-    return;
-  }
-
   std::set<GURL>* origins_to_return = new std::set<GURL>();
   indexed_db_context_->TaskRunner()->PostTaskAndReply(
       FROM_HERE,
@@ -137,12 +125,6 @@ void IndexedDBQuotaClient::GetOriginsForHost(
     return;
   }
 
-  // No task runner means unit test; no cleanup necessary.
-  if (!indexed_db_context_->TaskRunner()) {
-    callback.Run(std::set<GURL>());
-    return;
-  }
-
   std::set<GURL>* origins_to_return = new std::set<GURL>();
   indexed_db_context_->TaskRunner()->PostTaskAndReply(
       FROM_HERE,
@@ -160,12 +142,6 @@ void IndexedDBQuotaClient::DeleteOriginData(const GURL& origin,
     return;
   }
 
-  // No task runner means unit test; no cleanup necessary.
-  if (!indexed_db_context_->TaskRunner()) {
-    callback.Run(storage::kQuotaStatusOk);
-    return;
-  }
-
   base::PostTaskAndReplyWithResult(
       indexed_db_context_->TaskRunner(), FROM_HERE,
       base::Bind(&DeleteOriginDataOnIndexedDBThread,