Fix following r1175: the section name is __debug_info, not .debug_info.

Review URL: https://breakpad.appspot.com/583003

git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@1178 4c0a9323-5329-0410-9bdc-e9ce6186880e
diff --git a/src/common/mac/dump_syms.mm b/src/common/mac/dump_syms.mm
index c8c3a35..113a16c 100644
--- a/src/common/mac/dump_syms.mm
+++ b/src/common/mac/dump_syms.mm
@@ -276,7 +276,7 @@
 
   // Find the __debug_info section.
   dwarf2reader::SectionMap::const_iterator debug_info_entry =
-      file_context.section_map().find(".debug_info");
+      file_context.section_map().find("__debug_info");
   assert(debug_info_entry != file_context.section_map().end());
   const std::pair<const char*, uint64>& debug_info_section =
       debug_info_entry->second;