Allow Print() to be called by const instances of MinidumpLinuxMaps and

MinidumpLinuxMapsList.

R=ivanpe@chromium.org

Review URL: https://codereview.chromium.org/1287803002

git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@1482 4c0a9323-5329-0410-9bdc-e9ce6186880e

src/google_breakpad/processor/minidump.h

@@ -892,7 +892,7 @@ class MinidumpLinuxMaps : public MinidumpObject {
   const string GetPathname() const { return valid_ ? region_.path : ""; }
 
   // Print the contents of this mapping.
-  void Print();
+  void Print() const;
 
  private:
   // These objects are managed by MinidumpLinuxMapsList.
@@ -920,7 +920,7 @@ class MinidumpLinuxMapsList : public MinidumpStream {
   const MinidumpLinuxMaps *GetLinuxMapsAtIndex(unsigned int index) const;
 
   // Print the contents of /proc/self/maps to stdout.
-  void Print();
+  void Print() const;
 
  private:
   friend class Minidump;