Improve modules' TypeError exception messages.

LayoutTests/storage/indexeddb/exceptions-expected.txt

 Test that expected exceptions are thrown per IndexedDB spec.
 
 On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
 
 
 indexedDB = self.indexedDB || self.webkitIndexedDB || self.mozIndexedDB || self.msIndexedDB || self.OIndexedDB;
 
 dbname = "exceptions.html"
 indexedDB.deleteDatabase(dbname)
 indexedDB.open(dbname)
@@ skipping 88 matching lines @@
 Exception message: Failed to execute 'transaction' on 'IDBDatabase': A version change transaction is running.
 One of the names provided in the storeNames argument doesn't exist in this database.
 Expecting exception from db.transaction('no-such-store')
 PASS Exception was thrown.
 PASS code is DOMException.NOT_FOUND_ERR
 PASS ename is 'NotFoundError'
 Exception message: Failed to execute 'transaction' on 'IDBDatabase': One of the specified object stores was not found.
 The value for the mode parameter is invalid.
 Expecting TypeError exception from db.transaction('store', 'invalid-mode')
 PASS Exception was thrown.
-PASS db.transaction('store', 'invalid-mode') threw TypeError: Type error
+PASS db.transaction('store', 'invalid-mode') threw TypeError: Failed to execute 'transaction' on 'IDBDatabase': The mode provided ('invalid-mode') is not one of 'readonly' or 'readwrite'.
 The function was called with an empty list of store names
 Expecting exception from db.transaction([])
 PASS Exception was thrown.
 PASS code is DOMException.INVALID_ACCESS_ERR
 PASS ename is 'InvalidAccessError'
 Exception message: Failed to execute 'transaction' on 'IDBDatabase': The storeNames parameter was empty.
 
 One more IDBDatabase.createObjectStore() test:
 If this function is called from outside a "versionchange" transaction callback ... the implementation must throw a DOMException of type InvalidStateError.
 Expecting exception from db.createObjectStore('fail')
@@ skipping 127 matching lines @@
 Exception message: Failed to execute 'openCursor' on 'IDBObjectStore': The parameter is not a valid key.
 The transaction this IDBObjectStore belongs to is not active.
 Expecting exception from storeFromInactiveTransaction.openCursor()
 PASS Exception was thrown.
 PASS code is 0
 PASS ename is 'TransactionInactiveError'
 Exception message: Failed to execute 'openCursor' on 'IDBObjectStore': The transaction has finished.
 The value for the direction parameter is invalid.
 Expecting TypeError exception from store.openCursor(0, 'invalid-direction')
 PASS Exception was thrown.
-PASS store.openCursor(0, 'invalid-direction') threw TypeError: Type error
+PASS store.openCursor(0, 'invalid-direction') threw TypeError: Failed to execute 'openCursor' on 'IDBObjectStore': The direction provided ('invalid-direction') is not one of 'next', 'nextunique', 'prev', or 'prevunique'.
 
 IDBObjectStore.openKeyCursor()
 If the range parameter is specified but is not a valid key or a key range, this method throws a DOMException of type DataError.
 Expecting exception from store.openKeyCursor({})
 PASS Exception was thrown.
 PASS code is 0
 PASS ename is 'DataError'
 Exception message: Failed to execute 'openKeyCursor' on 'IDBObjectStore': The parameter is not a valid key.
 The transaction this IDBObjectStore belongs to is not active.
 Expecting exception from storeFromInactiveTransaction.openKeyCursor()
 PASS Exception was thrown.
 PASS code is 0
 PASS ename is 'TransactionInactiveError'
 Exception message: Failed to execute 'openKeyCursor' on 'IDBObjectStore': The transaction has finished.
 The value for the direction parameter is invalid.
 Expecting TypeError exception from store.openKeyCursor(0, 'invalid-direction')
 PASS Exception was thrown.
-PASS store.openKeyCursor(0, 'invalid-direction') threw TypeError: Type error
+PASS store.openKeyCursor(0, 'invalid-direction') threw TypeError: Failed to execute 'openKeyCursor' on 'IDBObjectStore': The direction provided ('invalid-direction') is not one of 'next', 'nextunique', 'prev', or 'prevunique'.
 
 IDBObjectStore.put()
 This method throws a DOMException of type ReadOnlyError if the transaction which this IDBObjectStore belongs to is has its mode set to "readonly".
 Expecting exception from storeFromReadOnlyTransaction.put(0, 0)
 PASS Exception was thrown.
 PASS code is 0
 PASS ename is 'ReadOnlyError'
 Exception message: A write operation was attempted in a read-only transaction.
 The transaction this IDBObjectStore belongs to is not active.
 Expecting exception from storeFromInactiveTransaction.put(0, 0)
@@ skipping 116 matching lines @@
 Exception message: Failed to execute 'openCursor' on 'IDBIndex': The parameter is not a valid key.
 The transaction this IDBIndex belongs to is not active.
 Expecting exception from indexFromInactiveTransaction.openCursor()
 PASS Exception was thrown.
 PASS code is 0
 PASS ename is 'TransactionInactiveError'
 Exception message: Failed to execute 'openCursor' on 'IDBIndex': The transaction has finished.
 The value for the direction parameter is invalid.
 Expecting TypeError exception from index.openCursor(0, 'invalid-direction')
 PASS Exception was thrown.
-PASS index.openCursor(0, 'invalid-direction') threw TypeError: Type error
+PASS index.openCursor(0, 'invalid-direction') threw TypeError: Failed to execute 'openCursor' on 'IDBIndex': The direction provided ('invalid-direction') is not one of 'next', 'nextunique', 'prev', or 'prevunique'.
 
 IDBIndex.openKeyCursor()
 If the range parameter is specified but is not a valid key or a key range, this method throws a DOMException of type DataError.
 Expecting exception from index.openKeyCursor({})
 PASS Exception was thrown.
 PASS code is 0
 PASS ename is 'DataError'
 Exception message: Failed to execute 'openKeyCursor' on 'IDBIndex': The parameter is not a valid key.
 The transaction this IDBIndex belongs to is not active.
 Expecting exception from indexFromInactiveTransaction.openKeyCursor()
 PASS Exception was thrown.
 PASS code is 0
 PASS ename is 'TransactionInactiveError'
 Exception message: Failed to execute 'openKeyCursor' on 'IDBIndex': The transaction has finished.
 The value for the direction parameter is invalid.
 Expecting TypeError exception from index.openKeyCursor(0, 'invalid-direction')
 PASS Exception was thrown.
-PASS index.openKeyCursor(0, 'invalid-direction') threw TypeError: Type error
+PASS index.openKeyCursor(0, 'invalid-direction') threw TypeError: Failed to execute 'openKeyCursor' on 'IDBIndex': The direction provided ('invalid-direction') is not one of 'next', 'nextunique', 'prev', or 'prevunique'.
 
 3.2.7 Cursor
 transaction = db.transaction(['store', 'inlineKeyStore'], 'readwrite')
 request = transaction.objectStore('store').openCursor()
 cursor = request.result
 request = transaction.objectStore('store').index('index').openKeyCursor()
 keyCursor = request.result
 request = transaction.objectStore('store').openCursor(IDBKeyRange.lowerBound(-Infinity), 'prev')
 reverseCursor = request.result
 request = transaction.objectStore('inlineKeyStore').openCursor()
@@ skipping 121 matching lines @@
 If the requested object store is not in this transaction's scope.
 Expecting exception from db.transaction('store').objectStore('otherStore')
 PASS Exception was thrown.
 PASS code is DOMException.NOT_FOUND_ERR
 PASS ename is 'NotFoundError'
 Exception message: Failed to execute 'objectStore' on 'IDBTransaction': The specified object store was not found.
 PASS successfullyParsed is true
 
 TEST COMPLETE