Always load signin profile on Chrome OS startup.

chrome/browser/safe_browsing/safe_browsing_service_browsertest.cc

Index: chrome/browser/safe_browsing/safe_browsing_service_browsertest.cc
diff --git a/chrome/browser/safe_browsing/safe_browsing_service_browsertest.cc b/chrome/browser/safe_browsing/safe_browsing_service_browsertest.cc
index 5ba5da999320eff17c052e0401baaa26e76b24a1..f2c489dcc29b6345ca7d6c2f31634b0f3a4be2d9 100644
--- a/chrome/browser/safe_browsing/safe_browsing_service_browsertest.cc
+++ b/chrome/browser/safe_browsing/safe_browsing_service_browsertest.cc
@@ -44,6 +44,10 @@
 #include "sql/statement.h"
 #include "testing/gmock/include/gmock/gmock.h"
 
+#if defined(OS_CHROMEOS)
+#include "chrome/browser/chromeos/profiles/profile_helper.h"
+#endif
+
 using content::BrowserThread;
 using content::InterstitialPage;
 using content::WebContents;
@@ -765,6 +769,14 @@ IN_PROC_BROWSER_TEST_F(SafeBrowsingServiceTest, StartAndStop) {
   // Change the other pref. SBS should stop now.
   pref_service2->SetBoolean(prefs::kSafeBrowsingEnabled, false);
   WaitForIOThread();
+#if defined(CHROME_OS)
+  // On Chrome OS we should disable safe browsing for signin profile.
+  EXPECT_TRUE(sb_service->enabled());
+  EXPECT_TRUE(csd_service->enabled());
+  chromeos::ProfileHelper::GetSigninProfile()->GetOriginalProfile()->
+      GetPrefs()->SetBoolean(prefs::kSafeBrowsingEnabled, false);
+  WaitForIOThread();
+#endif
   EXPECT_FALSE(sb_service->enabled());
   EXPECT_FALSE(csd_service->enabled());