Make the policy fetch for first time login blocking

chrome/test/base/in_process_browser_test.h

Index: chrome/test/base/in_process_browser_test.h
diff --git a/chrome/test/base/in_process_browser_test.h b/chrome/test/base/in_process_browser_test.h
index a64a47d349862b32cac8c1d2d9558d33ac5bce81..925846eb03e3ad25a0564aabf048accc4e4dc1a7 100644
--- a/chrome/test/base/in_process_browser_test.h
+++ b/chrome/test/base/in_process_browser_test.h
@@ -171,6 +171,10 @@ class InProcessBrowserTest : public content::BrowserTestBase {
     exit_when_last_browser_closes_ = value;
   }
 
+  void set_open_about_blank_on_browser_launch(bool value) {
+    open_about_blank_on_browser_launch_ = value;
+  }
+
   // This must be called before RunTestOnMainThreadLoop() to have any effect.
   void set_multi_desktop_test(bool multi_desktop_test) {
     multi_desktop_test_ = multi_desktop_test;
@@ -198,6 +202,9 @@ class InProcessBrowserTest : public content::BrowserTestBase {
   // True if we should exit the tests after the last browser instance closes.
   bool exit_when_last_browser_closes_;
 
+  // True if the about:blank tab should be opened when the browser is launched.
+  bool open_about_blank_on_browser_launch_;
+
   // True if this is a multi-desktop test (in which case this browser test will
   // not ensure that Browsers are only created on the tested desktop).
   bool multi_desktop_test_;