Improve handling of failed integer type conversions.

LayoutTests/storage/indexeddb/cursor-advance-workers-expected.txt

 [Worker] Test IndexedDB cursor.advance().
 
 On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
 
 
 Starting worker: resources/cursor-advance.js
 [Worker] indexedDB = self.indexedDB || self.webkitIndexedDB || self.mozIndexedDB || self.msIndexedDB || self.OIndexedDB;
 [Worker] 
 [Worker] dbname = "cursor-advance.js"
 [Worker] indexedDB.deleteDatabase(dbname)
@@ skipping 161 matching lines @@
 [Worker] 
 [Worker] prefetch():
 [Worker] testBadAdvance()
 [Worker] trans = db.transaction(objectStoreName, 'readwrite')
 [Worker] objectStore = trans.objectStore(objectStoreName)
 [Worker] request = objectStore.openCursor()
 [Worker] 
 [Worker] advanceBadly():
 [Worker] Expecting TypeError exception from cursor.advance(0)
 PASS [Worker] Exception was thrown.
-PASS [Worker] cursor.advance(0) threw TypeError: Type error
+PASS [Worker] cursor.advance(0) threw TypeError: Failed to execute 'advance' on 'IDBCursor': A count argument with value 0 (zero) was supplied, must be greater than 0.
 [Worker] Expecting TypeError exception from cursor.advance(-1)
 PASS [Worker] Exception was thrown.
-PASS [Worker] cursor.advance(-1) threw TypeError: Type error
+PASS [Worker] cursor.advance(-1) threw TypeError: Failed to execute 'advance' on 'IDBCursor': Value is outside the 'unsigned long' value range.
 [Worker] Expecting TypeError exception from cursor.advance(0x100000000)
 PASS [Worker] Exception was thrown.
-PASS [Worker] cursor.advance(0x100000000) threw TypeError: Type error
+PASS [Worker] cursor.advance(0x100000000) threw TypeError: Failed to execute 'advance' on 'IDBCursor': Value is outside the 'unsigned long' value range.
 [Worker] Expecting TypeError exception from cursor.advance(0x20000000000000)
 PASS [Worker] Exception was thrown.
-PASS [Worker] cursor.advance(0x20000000000000) threw TypeError: Type error
+PASS [Worker] cursor.advance(0x20000000000000) threw TypeError: Failed to execute 'advance' on 'IDBCursor': Value is outside the 'unsigned long' value range.
 [Worker] 
 [Worker] testEdges():
 [Worker] trans = db.transaction(objectStoreName, 'readonly')
 [Worker] objectStore = trans.objectStore(objectStoreName)
 [Worker] request = objectStore.openCursor()
 [Worker] 
 [Worker] onSuccess():
 [Worker] cursor = event.target.result
 PASS [Worker] cursor is non-null.
 [Worker] cursor.advance(0xffffffff)
@@ skipping 44 matching lines @@
 [Worker] 
 [Worker] deleteSecond():
 PASS [Worker] expected is "{\"key\":\"237-23-7744\",\"value\":{\"name\":\"Pug\",\"height\":66,\"weight\":110},\"primaryKey\":\"237-23-7744\"}"
 [Worker] cursor.advance(1)
 [Worker] 
 [Worker] deleteSecond():
 PASS successfullyParsed is true
 
 TEST COMPLETE