Adding a SQL implementation of the backing store for previews opt outs

chrome/common/chrome_constants.cc

Index: chrome/common/chrome_constants.cc
diff --git a/chrome/common/chrome_constants.cc b/chrome/common/chrome_constants.cc
index 0a96fa23db6edb6f24d10280467835d14871952e..b8ba7b330897fa3f2c393f78d9c081296de7e4ad 100644
--- a/chrome/common/chrome_constants.cc
+++ b/chrome/common/chrome_constants.cc
@@ -149,20 +149,22 @@ const base::FilePath::CharType kLocalStorePoolName[] = FPL("LocalStorePool");
 const base::FilePath::CharType kMediaCacheDirname[] = FPL("Media Cache");
 const base::FilePath::CharType kNetworkPersistentStateFilename[] =
     FPL("Network Persistent State");
 const base::FilePath::CharType kOfflinePageArchivesDirname[] =
     FPL("Offline Pages/archives");
 const base::FilePath::CharType kOfflinePageMetadataDirname[] =
     FPL("Offline Pages/metadata");
 const base::FilePath::CharType kOfflinePageRequestQueueDirname[] =
     FPL("Offline Pages/request_queue");
 const base::FilePath::CharType kPreferencesFilename[] = FPL("Preferences");
+const base::FilePath::CharType kPreviewsOptOutDBFilename[] =
+    FPL("previews_opt_out.db");
 const base::FilePath::CharType kProtectedPreferencesFilenameDeprecated[] =
     FPL("Protected Preferences");
 const base::FilePath::CharType kReadmeFilename[] = FPL("README");
 const base::FilePath::CharType kSafeBrowsingBaseFilename[] =
     FPL("Safe Browsing");
 const base::FilePath::CharType kSecurePreferencesFilename[] =
     FPL("Secure Preferences");
 const base::FilePath::CharType kServiceStateFileName[] = FPL("Service State");
 const base::FilePath::CharType kSingletonCookieFilename[] =
     FPL("SingletonCookie");