Move const double data out of header file

components/offline_pages/offline_page_storage_manager.h

Index: components/offline_pages/offline_page_storage_manager.h
diff --git a/components/offline_pages/offline_page_storage_manager.h b/components/offline_pages/offline_page_storage_manager.h
index 28fa130002123d0122577f9485ba15f8ece573ec..25f891f6900ede9643e3391fd1d4507cc1f3f46d 100644
--- a/components/offline_pages/offline_page_storage_manager.h
+++ b/components/offline_pages/offline_page_storage_manager.h
@@ -24,14 +24,14 @@ namespace offline_pages {
 
 // Maximum % of total available storage that will be occupied by offline pages
 // before a storage clearup.
-const double kOfflinePageStorageLimit = 0.3;
+extern const double kOfflinePageStorageLimit;
 // The target % of storage usage we try to reach below when expiring pages.
-const double kOfflinePageStorageClearThreshold = 0.1;
+extern const double kOfflinePageStorageClearThreshold;
 // The time that the storage cleanup will be triggered again since the last one.
-const base::TimeDelta kClearStorageInterval = base::TimeDelta::FromMinutes(10);
+extern const base::TimeDelta kClearStorageInterval;
 // The time that the page record will be removed from the store since the page
 // has been expired.
-const base::TimeDelta kRemovePageItemInterval = base::TimeDelta::FromDays(21);
+extern const base::TimeDelta kRemovePageItemInterval;
 
 class ClientPolicyController;
 class OfflinePageModel;