Fixes for -Wunused-function on Linux, Android and ChromeOS

chrome/browser/lifetime/application_lifetime.cc

Index: chrome/browser/lifetime/application_lifetime.cc
diff --git a/chrome/browser/lifetime/application_lifetime.cc b/chrome/browser/lifetime/application_lifetime.cc
index aad24b1202bf2b71e9ab793075d66dc565a04502..711a075cdd433925cdc5fe69be2c4a47e239a49f 100644
--- a/chrome/browser/lifetime/application_lifetime.cc
+++ b/chrome/browser/lifetime/application_lifetime.cc
@@ -51,6 +51,7 @@
 namespace chrome {
 namespace {
 
+#if !defined(OS_ANDROID)
 // Returns true if all browsers can be closed without user interaction.
 // This currently checks if there is pending download, or if it needs to
 // handle unload handler.
@@ -71,6 +72,7 @@ bool AreAllBrowsersCloseable() {
   }
   return true;
 }
+#endif  // !defined(OS_ANDROID)
 
 int g_keep_alive_count = 0;