Make stack_frame_info vector hold linked_ptrs instead of objects;

make Stackwalker::Walk create and return a CallStack instead of filling a
caller-supplied one (#54).  r=bryner

Interface change: Stackwalker::Walk and MinidumpProcessor::Process now return
a new CallStack*.

http://groups.google.com/group/airbag-dev/browse_thread/thread/d2bad5d7c115c3fe


git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@45 4c0a9323-5329-0410-9bdc-e9ce6186880e

src/processor/stackwalker_ppc.h

@@ -65,7 +65,9 @@ class StackwalkerPPC : public Stackwalker {
   // saved program counter in %srr0) and stack conventions (saved stack
   // pointer at 0(%r1), return address at 8(0(%r1)).
   virtual StackFrame* GetContextFrame();
-  virtual StackFrame* GetCallerFrame(const CallStack *stack);
+  virtual StackFrame* GetCallerFrame(
+      const CallStack *stack,
+      const vector< linked_ptr<StackFrameInfo> > &stack_frame_info);
 
   // Stores the CPU context corresponding to the innermost stack frame to
   // be returned by GetContextFrame.