Add inline annotation for base::MakeCriticalClosure() in platform other than ios.

base/critical_closure.h

Index: base/critical_closure.h
diff --git a/base/critical_closure.h b/base/critical_closure.h
index bb038dd372044ac50fc4a45b3141d88b35173f7c..ca51ed5cef27d40923ba8e4d99de4044c63fa457 100644
--- a/base/critical_closure.h
+++ b/base/critical_closure.h
@@ -25,7 +25,7 @@ namespace base {
 #if defined(OS_IOS)
 base::Closure MakeCriticalClosure(const base::Closure& closure);
 #else
-base::Closure MakeCriticalClosure(const base::Closure& closure) {
+inline base::Closure MakeCriticalClosure(const base::Closure& closure) {
   // No-op for platforms where the application does not need to acquire
   // background time for closures to finish when it goes into the background.
   return closure;