The SQLitePersistentCookieStore should use a non-partial index on iOS.

I recently added the "transient" partial index to the
SQLitePersistentCookieStore. iOS 8.1 and older doesn't have access to SQLite
3.8+, so it can't use partial indices. Instead, use a full index on
SQLitePersistentCookieStore on iOS.

BUG=478346

Review URL: https://codereview.chromium.org/1098883005

Cr-Commit-Position: refs/heads/master@{#327130}

content/browser/net/sqlite_persistent_cookie_store.cc

@@ -432,9 +432,15 @@ bool InitTable(sql::Connection* db) {
   if (!db->Execute("CREATE INDEX domain ON cookies(host_key)"))
     return false;
 
+#if defined(OS_IOS)
+  // iOS 8.1 and older doesn't support partial indices. iOS 8.2 supports
+  // partial indices.
+  if (!db->Execute("CREATE INDEX is_transient ON cookies(persistent)")) {
+#else
   if (!db->Execute(
           "CREATE INDEX is_transient ON cookies(persistent) "
           "where persistent != 1")) {
+#endif
     return false;
   }
 
@@ -984,9 +990,16 @@ bool SQLitePersistentCookieStore::Backend::EnsureDatabaseVersion() {
       return false;
     }
 
+#if defined(OS_IOS)
+    // iOS 8.1 and older doesn't support partial indices. iOS 8.2 supports
+    // partial indices.
+    if (!db_->Execute(
+        "CREATE INDEX IF NOT EXISTS is_transient ON cookies(persistent)")) {
+#else
     if (!db_->Execute(
-            "CREATE INDEX IF NOT EXISTS is_transient ON cookies(persistent) "
-            "where persistent != 1")) {
+        "CREATE INDEX IF NOT EXISTS is_transient ON cookies(persistent) "
+        "where persistent != 1")) {
+#endif
       LOG(WARNING)
           << "Unable to create index is_transient in update to version 9.";
       return false;