Added completion notification to Profile's ClearNetworkingHistorySince.

chrome/browser/profiles/profile_io_data.cc

Index: chrome/browser/profiles/profile_io_data.cc
diff --git a/chrome/browser/profiles/profile_io_data.cc b/chrome/browser/profiles/profile_io_data.cc
index 1da278c25b04d705366dd3cf51128aa41062ffbe..68e395d8b8b45c0aae6b620432ca1ca2d2e9cfe9 100644
--- a/chrome/browser/profiles/profile_io_data.cc
+++ b/chrome/browser/profiles/profile_io_data.cc
@@ -724,3 +724,12 @@ void ProfileIOData::PopulateNetworkSessionParams(
         switches::kTrustedSpdyProxy);
   }
 }
+
+void ProfileIOData::InitForTesting() {
+  initialized_ = true;
+  initialized_on_UI_thread_ = true;
+
+  // Set up a TransportSecurityState for testing removing browsing data.
+  transport_security_state_.reset(new net::TransportSecurityState());
+}
+