Make kClearSiteDataOnExit work correctly for Flash in multi-profile.

content/browser/plugin_process_host.h

Index: content/browser/plugin_process_host.h
===================================================================
--- content/browser/plugin_process_host.h	(revision 90949)
+++ content/browser/plugin_process_host.h	(working copy)
@@ -45,6 +45,7 @@
     // the channel.
     virtual int ID() = 0;
     virtual bool OffTheRecord() = 0;
+    virtual bool SaveLocalState() = 0;

[Bernhard Bauer, 2011/06/30 12:24:12]

I think we should collapse |OffTheRecord| and |SaveLocalState| already in the
PluginProcessHost::Client, as they both essentially tell the plug-in not to save
state (and whether this is because of incognito mode or a preference is a
chrome/ thing, not a content/ thing). 

[Miranda Callahan, 2011/06/30 13:38:43]

Ha -- I woke up at four in the morning and had the same thought. Done.

     virtual void SetPluginInfo(const webkit::npapi::WebPluginInfo& info) = 0;
     // The client should delete itself when one of these methods is called.
     virtual void OnChannelOpened(const IPC::ChannelHandle& handle) = 0;