Fixed stack overflow in CPPextension function. An arbitrary size buffer was being used for extension name. Changed it to use MAX_SYMBOL_NAME_LEN.
- Also formalized the values for MAX_SYMBOL_NAME_LEN and MAX_STRING_LEN. They were being used as if there was a confusion whether it included the NULL terminator or not.
- Fixed some minor issues with code releated to the usage of MAX_SYMBOL_NAME_LEN and MAX_STRING_LEN.
BUG=59625 (crbug.com)
Review URL: http://codereview.appspot.com/2585042

git-svn-id: https://angleproject.googlecode.com/svn/trunk@464 736b8ea6-26fd-11df-bfd4-992fa37f6226