Improve handling of failed integer type conversions.

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

 Test IndexedDB cursor.advance().
 
 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 = "cursor-advance.html"
 indexedDB.deleteDatabase(dbname)
 indexedDB.open(dbname)
@@ skipping 160 matching lines @@
 
 prefetch():
 testBadAdvance()
 trans = db.transaction(objectStoreName, 'readwrite')
 objectStore = trans.objectStore(objectStoreName)
 request = objectStore.openCursor()
 
 advanceBadly():
 Expecting TypeError exception from cursor.advance(0)
 PASS Exception was thrown.
-PASS cursor.advance(0) threw TypeError: Type error
+PASS 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.
 Expecting TypeError exception from cursor.advance(-1)
 PASS Exception was thrown.
-PASS cursor.advance(-1) threw TypeError: Type error
+PASS cursor.advance(-1) threw TypeError: Failed to execute 'advance' on 'IDBCursor': Value is outside the 'unsigned long' value range.
 Expecting TypeError exception from cursor.advance(0x100000000)
 PASS Exception was thrown.
-PASS cursor.advance(0x100000000) threw TypeError: Type error
+PASS cursor.advance(0x100000000) threw TypeError: Failed to execute 'advance' on 'IDBCursor': Value is outside the 'unsigned long' value range.
 Expecting TypeError exception from cursor.advance(0x20000000000000)
 PASS Exception was thrown.
-PASS cursor.advance(0x20000000000000) threw TypeError: Type error
+PASS cursor.advance(0x20000000000000) threw TypeError: Failed to execute 'advance' on 'IDBCursor': Value is outside the 'unsigned long' value range.
 
 testEdges():
 trans = db.transaction(objectStoreName, 'readonly')
 objectStore = trans.objectStore(objectStoreName)
 request = objectStore.openCursor()
 
 onSuccess():
 cursor = event.target.result
 PASS cursor is non-null.
 cursor.advance(0xffffffff)
@@ skipping 44 matching lines @@
 
 deleteSecond():
 PASS expected is "{\"key\":\"237-23-7744\",\"value\":{\"name\":\"Pug\",\"height\":66,\"weight\":110},\"primaryKey\":\"237-23-7744\"}"
 cursor.advance(1)
 
 deleteSecond():
 PASS successfullyParsed is true
 
 TEST COMPLETE