Breakpad DWARF parser: Expand comments for ByteReader class.
Breakpad DWARF parser: Expand comments for ByteReader class.

This is preparation for adding support for reading Linux C++ exception
handling data's encoded pointers. The change should have no user-visible
effect; it simply expands the comments for dwarf2reader::ByteReader, and
regroups the member functions.

a=jimblandy, r=nealsid


git-svn-id: 7939527bf0a06ad24ad020f729d5600cb42ed5d7@522 4c0a9323-5329-0410-9bdc-e9ce6186880e

darwin/breakpad,albertz/google-breakpad,colesbury/google-breakpad,bittorrent/breakpad,hkratz/breakpad_track_svn,wesen/google-breakpad,albertz/google-breakpad,bittorrent/breakpad,albertz/google-breakpad,hkratz/breakpad_track_svn,bbcallen/google-breakpad,albertz/google-breakpad,bittorrent/breakpad,hkratz/breakpad_track_svn,mhoran/google-breakpad,colesbury/google-breakpad,Quiark/google-breakpad,AlekSi/google-breakpad-mirror,AlekSi/google-breakpad-mirror,bittorrent/breakpad,bittorrent/breakpad,wesen/google-breakpad,colesbury/google-breakpad,bittorrent/breakpad,AlekSi/google-breakpad-mirror,bbcallen/google-breakpad,Quiark/google-breakpad,colesbury/google-breakpad,wesen/google-breakpad,mhoran/google-breakpad,bbcallen/google-breakpad,bittorrent/breakpad,bbcallen/google-breakpad,colesbury/google-breakpad,mhoran/google-breakpad,bbcallen/google-breakpad,bbcallen/google-breakpad,wesen/google-breakpad,albertz/google-breakpad,Quiark/google-breakpad,mhoran/google-breakpad,darwin/breakpad,AlekSi/google-breakpad-mirror,Quiark/google-breakpad,mhoran/google-breakpad,wesen/google-breakpad,mhoran/google-breakpad,hkratz/breakpad_track_svn,hkratz/breakpad_track_svn,Quiark/google-breakpad,darwin/breakpad,colesbury/google-breakpad,AlekSi/google-breakpad-mirror,hkratz/breakpad_track_svn,wesen/google-breakpad,Quiark/google-breakpad,albertz/google-breakpad