Cleanup: Pull some browser keep alive functions into its own file.

chrome/browser/apps/app_window_interactive_uitest.cc

Index: chrome/browser/apps/app_window_interactive_uitest.cc
diff --git a/chrome/browser/apps/app_window_interactive_uitest.cc b/chrome/browser/apps/app_window_interactive_uitest.cc
index fa7d6d76486485c9879bea6d99269e96938e312e..2cc7598166126b9ae004598ebc850c32cd7d7d78 100644
--- a/chrome/browser/apps/app_window_interactive_uitest.cc
+++ b/chrome/browser/apps/app_window_interactive_uitest.cc
@@ -4,6 +4,7 @@
 
 #include "chrome/browser/apps/app_browsertest_util.h"
 #include "chrome/browser/lifetime/application_lifetime.h"
+#include "chrome/browser/lifetime/browser_keep_alive.h"
 #include "chrome/browser/ui/browser_iterator.h"
 #include "chrome/browser/ui/browser_window.h"
 #include "chrome/test/base/interactive_test_utils.h"
@@ -526,9 +527,9 @@ IN_PROC_BROWSER_TEST_F(AppWindowHiddenKeepAliveTest, ShownThenHidden) {
   for (chrome::BrowserIterator it; !it.done(); it.Next())
     it->window()->Close();
 
-  EXPECT_TRUE(chrome::WillKeepAlive());
+  EXPECT_TRUE(browser_lifetime::WillKeepAlive());
   GetFirstAppWindow()->Hide();
-  EXPECT_FALSE(chrome::WillKeepAlive());
+  EXPECT_FALSE(browser_lifetime::WillKeepAlive());
 }
 
 // A window that is hidden but re-shown should still keep Chrome alive.
@@ -538,10 +539,10 @@ IN_PROC_BROWSER_TEST_F(AppWindowHiddenKeepAliveTest, ShownThenHiddenThenShown) {
   app_window->Hide();
   app_window->Show(AppWindow::SHOW_ACTIVE);
 
-  EXPECT_TRUE(chrome::WillKeepAlive());
+  EXPECT_TRUE(browser_lifetime::WillKeepAlive());
   for (chrome::BrowserIterator it; !it.done(); it.Next())
     it->window()->Close();
-  EXPECT_TRUE(chrome::WillKeepAlive());
+  EXPECT_TRUE(browser_lifetime::WillKeepAlive());
   app_window->GetBaseWindow()->Close();
 }
 
@@ -575,7 +576,7 @@ IN_PROC_BROWSER_TEST_F(AppWindowHiddenKeepAliveTest, HiddenThenShown) {
   launched_listener.Reply("");
   EXPECT_TRUE(shown_listener.WaitUntilSatisfied());
   EXPECT_FALSE(app_window->is_hidden());
-  EXPECT_TRUE(chrome::WillKeepAlive());
+  EXPECT_TRUE(browser_lifetime::WillKeepAlive());
   app_window->GetBaseWindow()->Close();
 }