Implementation of URLLoader using PluginResource/ResourceHost.

This change is essentially the same as:  https://codereview.chromium.org/11416363
Here's the description from that CL:

"This doesn't use the resource call/reply infrastructure, but rather pipes WebKit callbacks to the
plugin via unsolicited callbacks. This eliminates state tracking in the host which makes things
simpler.

This fixes some bugs in Close() as well to fix the below-mentioned bug."
Other things contained in the original CL:

- Add a GetPluginPID method to RendererPpapiHost. This is needed when the loader host Opens()
a request.

- Add a HandleDocumentLoad method to PluginDelegate and implements it in PepperPluginDelegateImpl.
This creates the host for both in- and out-of-process proxies.

- Removes the GetURLLoaderBufferedBytes function from the PPB_Proxy_Private interface.

- Removes the HandleDocumentLoad implementation in the PPP_Instance_Proxy class.

- Removes the document_loader_ field from webkit::ppapi::WebPluginImpl and changes the
implementation to forward document load notifications to the PluginInstance.

- Changes the PluginInstance to manage the document loader.

This CL differs from the original in two ways.

First, the trusted interface keeps the RegisterStatusCallback function. The NaCl plugin relies on
this to generate progress messages back to the embedding page.

Second, PluginInstance is changed to recognize when it's a NaCl instance, and to defer calling
the plugin delegate's HandleDocumentLoad method until after the proxy is switched. In the meantime,
it saves document events in a special loader object. When the proxy is switched, the delegate's
HandleDocumentLoad method is called and the response and document events are then replayed
through the new loader resource.

BUG=69457
R=brettw@chromium.org

Review URL: https://codereview.chromium.org/14371021

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@200412 0039d316-1c4b-4281-b951-d872f2087c98

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