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/stackwalker_ppc.h

@@ -45,19 +45,17 @@
 
 namespace google_airbag {
 
-class MinidumpContext;
-class MinidumpModuleList;
-
+class CodeModules;
 
 class StackwalkerPPC : public Stackwalker {
  public:
-  // context is a MinidumpContext object that gives access to ppc-specific
+  // context is a ppc context object that gives access to ppc-specific
   // register state corresponding to the innermost called frame to be
   // included in the stack.  The other arguments are passed directly through
   // to the base Stackwalker constructor.
   StackwalkerPPC(const MDRawContextPPC *context,
                  MemoryRegion *memory,
-                 MinidumpModuleList *modules,
+                 const CodeModules *modules,
                  SymbolSupplier *supplier);
 
  private: