Breakpad processor: Don't pass Windows stack walking information to all walkers.

At the moment, the StackWalker GetCallerFrame member function expects
a vector of WindowsFrameInfo structures, even though WindowsFrameInfo
is only used or useful on one one implementation (StackWalkerX86).

This patch changes StackWalker::GetCallerFrame to no longer expect the
WindowsFrameInfo structures, and changes all implementations to match.

In particular, StackWalkerX86 is changed to find the WindowsFrameInfo
data itself, and store a pointer to whatever it got in the StackFrame
object itself (which is really a StackFrameX86).

To allow GetCallerFrame implementations to look up stack walking data,
StackWalker::resolver_ needs to be made protected, not private.

a=jimblandy, r=mmentovai


git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@491 4c0a9323-5329-0410-9bdc-e9ce6186880e

src/processor/stackwalker_ppc.h

@@ -65,9 +65,7 @@ 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,
-      const vector< linked_ptr<WindowsFrameInfo> > &stack_frame_info);
+  virtual StackFrame* GetCallerFrame(const CallStack *stack);
 
   // Stores the CPU context corresponding to the innermost stack frame to
   // be returned by GetContextFrame.