Removed the dependency of PepperPluginRegistry on Pepper proxy.

Removed the dependency of PepperPluginRegistry on Pepper proxy.

We would need to move PepperPluginRegistry to webkit/plugins/ppapi so that it can be used by test_shell. But before we can move it, we need to remove all dependencies on content and pepper/proxy.
TEST=Manually ran pepper 3d demos in-process and out-of-process.

[brettw, 2011-09-14 17:05:37]

I think this will work.

The key thing is that a dispatcher outlives instances.

As long as the object you're now implementing the delegates with are scoped to
the lifetime of the dispatcher and not the instance, and don't have any back
pointers to the instance / PepperPluginDelegateImpl.

[alokp, 2011-09-14 17:13:19]

On 2011/09/14 17:05:37, brettw wrote:
> I think this will work.
> 
> The key thing is that a dispatcher outlives instances.
> 
> As long as the object you're now implementing the delegates with are scoped to
> the lifetime of the dispatcher and not the instance, and don't have any back
> pointers to the instance / PepperPluginDelegateImpl.

That is correct. DispatcherWrapper owns both - dispatcher and delegate  without
any back pointers. I will add your comment to the code and also test with
multiple instances.

[alokp, 2011-09-14 17:42:04]

Also tested with multiple instances of a plugin. Manually deleted plugin
instances via dev-tools console. Did not see any issue.

[brettw, 2011-09-14 20:17:45]

LGTM

[commit-bot: I haz the power, 2011-09-15 07:36:51]

Change committed as 101259