[Enhanced Bookmarks] Make enhanced bookmarks default for Android.

components/enhanced_bookmarks/enhanced_bookmark_features.h

Index: components/enhanced_bookmarks/enhanced_bookmark_features.h
diff --git a/components/enhanced_bookmarks/enhanced_bookmark_features.h b/components/enhanced_bookmarks/enhanced_bookmark_features.h
index 22165734db5950585a20bd1375b04ecfdd3c6c0e..4131113e917c5f64493c6ae4d0bfa3883238d77f 100644
--- a/components/enhanced_bookmarks/enhanced_bookmark_features.h
+++ b/components/enhanced_bookmarks/enhanced_bookmark_features.h
@@ -7,8 +7,6 @@
 
 #include "build/build_config.h"
 
-#if defined(OS_IOS) || defined(OS_ANDROID)
-
 namespace enhanced_bookmarks {
 
 // Returns true if enhanced bookmarks is enabled.
@@ -16,6 +14,4 @@ bool IsEnhancedBookmarksEnabled();
 
 }  // namespace enhanced_bookmarks
 
-#endif
-
 #endif  // COMPONENTS_ENHANCED_BOOKMARKS_ENHANCED_BOOKMARK_FEATURES_H_