Use sequence<T> instead of T[] where possible and document exceptions

third_party/WebKit/Source/modules/quota/StorageQuota.idl

Index: third_party/WebKit/Source/modules/quota/StorageQuota.idl
diff --git a/third_party/WebKit/Source/modules/quota/StorageQuota.idl b/third_party/WebKit/Source/modules/quota/StorageQuota.idl
index a94e33510d25d214345b9ff27e6e12dbf0d1dbcf..dd5e19ffae819f450e84b562d3a51c1361d32977 100644
--- a/third_party/WebKit/Source/modules/quota/StorageQuota.idl
+++ b/third_party/WebKit/Source/modules/quota/StorageQuota.idl
@@ -28,15 +28,21 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
+// https://w3c.github.io/quota-api/#storagetype-enum
+
 enum StorageType {
     "temporary",
     "persistent"
 };
 
+// https://w3c.github.io/quota-api/#storagequota-interface
+
 [
     NoInterfaceObject,
     RuntimeEnabled=QuotaPromise
 ] interface StorageQuota {
+    // TODO(jsbell): |supportedTypes| should be FrozenArray<StorageType>.
+    // https://github.com/w3c/quota-api/issues/5
     readonly attribute StorageType[] supportedTypes;
     [CallWith=ScriptState] Promise queryInfo(StorageType type);
     [CallWith=ScriptState] Promise requestPersistentQuota([Clamp] unsigned long long newQuota);