Add the referrer url to the downloads table in the History database.

chrome/browser/history/history_database.cc

Index: chrome/browser/history/history_database.cc
diff --git a/chrome/browser/history/history_database.cc b/chrome/browser/history/history_database.cc
index 9be2f15bf4daca7aef5bcc68d5b569237dc23258..db0b95f09d42ed31ea1973b0b41e15c47f2f49a7 100644
--- a/chrome/browser/history/history_database.cc
+++ b/chrome/browser/history/history_database.cc
@@ -27,7 +27,7 @@ namespace {
 // Current version number. We write databases at the "current" version number,
 // but any previous version that can read the "compatible" one can make do with
 // or database without *too* many bad effects.
-static const int kCurrentVersionNumber = 25;
+static const int kCurrentVersionNumber = 26;
 static const int kCompatibleVersionNumber = 16;
 static const char kEarlyExpirationThresholdKey[] = "early_expiration_threshold";
 
@@ -418,6 +418,15 @@ sql::InitStatus HistoryDatabase::EnsureCurrentVersion() {
     meta_table_.SetVersionNumber(cur_version);
   }
 
+  if (cur_version == 25) {
+    if (!MigrateReferrer()) {
+      LOG(WARNING) << "Unable to migrate history to version 26";
+      return sql::INIT_FAILURE;
+    }
+    cur_version++;
+    meta_table_.SetVersionNumber(cur_version);
+  }
+
   // When the version is too old, we just try to continue anyway, there should
   // not be a released product that makes a database too old for us to handle.
   LOG_IF(WARNING, cur_version < GetCurrentVersion()) <<