Module API (#32). r=waylonis, bryner

- Introduces a standard API for dealing with modules.  MinidumpModule
   is now a concrete implementation of this API.  Code may interact with
   single modules using the CodeModule interface, and collections of
   modules using its container, the CodeModules interface.
 - CodeModule is used directly by SymbolSupplier implementations and
   SourceLineResolver.  Reliance on the specific implementation in
   MinidumpModule has been eliminated.
 - Module lists are now added to ProcessState objects.  Module references
   in each stack frame are now pointers to objects in these module lists.
 - The sample minidump_stackwalk tool prints the module list after printing
   all threads' stacks.

http://groups.google.com/group/airbag-dev/browse_frm/thread/a9c0550edde54cf8


git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@74 4c0a9323-5329-0410-9bdc-e9ce6186880e

src/processor/process_state.cc

@@ -35,6 +35,7 @@
 
 #include "google_airbag/processor/process_state.h"
 #include "google_airbag/processor/call_stack.h"
+#include "google_airbag/processor/code_modules.h"
 
 namespace google_airbag {
 
@@ -44,6 +45,8 @@ ProcessState::~ProcessState() {
        ++iterator) {
     delete *iterator;
   }
+
+  delete modules_;
 }
 
 }  // namespace google_airbag