Remove the length field from the index entries in data pack files.

tools/grit/grit/format/data_pack_unittest.py

Index: tools/grit/grit/format/data_pack_unittest.py
diff --git a/tools/grit/grit/format/data_pack_unittest.py b/tools/grit/grit/format/data_pack_unittest.py
index 77c4ba130e10763440cf13181262741b637cec35..aa26a2fa31302dcc00dc72844f2d516070d5e077 100644
--- a/tools/grit/grit/format/data_pack_unittest.py
+++ b/tools/grit/grit/format/data_pack_unittest.py
@@ -15,10 +15,14 @@ from grit.format import data_pack
 
 class FormatDataPackUnittest(unittest.TestCase):
   def testWriteDataPack(self):
-    expected = ('\x02\x00\x00\x00\x04\x00\x00\x00\x01\x000\x00\x00'
-        '\x00\x00\x00\x00\x00\x04\x000\x00\x00\x00\x0c\x00\x00\x00'
-        '\x06\x00<\x00\x00\x00\x0c\x00\x00\x00\n\x00H\x00'
-        '\x00\x00\x00\x00\x00\x00this is id 4this is id 6')
+    expected = (
+        '\x03\x00\x00\x00\x04\x00\x00\x00'  # header (version, no. entries)
+        '\x01\x00\x26\x00\x00\x00'          # index entry 1
+        '\x04\x00\x26\x00\x00\x00'          # index entry 4
+        '\x06\x00\x32\x00\x00\x00'          # index entry 6
+        '\x0a\x00\x3e\x00\x00\x00'          # index entry 10
+        '\x00\x00\x3e\x00\x00\x00'          # extra entry for the size of last
+        'this is id 4this is id 6')         # data
     input = { 1: "", 4: "this is id 4", 6: "this is id 6", 10: "" }
     output = data_pack.DataPack.WriteDataPack(input)
     self.failUnless(output == expected)