unittests: fix -Wnarrowing build errors

src/common/dwarf_cu_to_module.cc

 // Copyright (c) 2010 Google Inc.
 // All rights reserved.
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 // notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
@@ skipping 122 matching lines @@
     : filename_(filename),
       module_(module),
       handle_inter_cu_refs_(handle_inter_cu_refs),
       file_private_(new FilePrivate()) {
 }
 
 DwarfCUToModule::FileContext::~FileContext() {
 }
 
 void DwarfCUToModule::FileContext::AddSectionToSectionMap(
-    const string& name, const char* contents, uint64 length) {
+    const string& name, const uint8_t *contents, uint64 length) {
   section_map_[name] = std::make_pair(contents, length);
 }
 
 void DwarfCUToModule::FileContext::ClearSectionMapForTest() {
   section_map_.clear();
 }
 
 const dwarf2reader::SectionMap&
 DwarfCUToModule::FileContext::section_map() const {
   return section_map_;
@@ skipping 653 matching lines @@
   dwarf2reader::SectionMap::const_iterator map_entry
       = section_map.find(".debug_line");
   // Mac OS X puts DWARF data in sections whose names begin with "__"
   // instead of ".".
   if (map_entry == section_map.end())
     map_entry = section_map.find("__debug_line");
   if (map_entry == section_map.end()) {
     cu_context_->reporter->MissingSection(".debug_line");
     return;
   }
-  const char *section_start = map_entry->second.first;
+  const uint8_t *section_start = map_entry->second.first;
   uint64 section_length = map_entry->second.second;
   if (offset >= section_length) {
     cu_context_->reporter->BadLineInfoOffset(offset);
     return;
   }
   line_reader_->ReadProgram(section_start + offset, section_length - offset,
                             cu_context_->file_context->module_, &lines_);
 }
 
 namespace {
@@ skipping 236 matching lines @@
   return dwarf_version >= 2;
 }
 
 bool DwarfCUToModule::StartRootDIE(uint64 offset, enum DwarfTag tag) {
   // We don't deal with partial compilation units (the only other tag
   // likely to be used for root DIE).
   return tag == dwarf2reader::DW_TAG_compile_unit;
 }
 
 } // namespace google_breakpad