Split ppapi::PluginList from PepperPluginRegistry so that DRT could load pepper plugins.

content/common/content_client.h

Index: content/common/content_client.h
===================================================================
--- content/common/content_client.h	(revision 101488)
+++ content/common/content_client.h	(working copy)
@@ -17,7 +17,6 @@
 class CommandLine;
 class GURL;
 struct GPUInfo;
-struct PepperPluginInfo;
 
 namespace IPC {
 class Message;
@@ -31,6 +30,12 @@
 class TargetPolicy;
 }
 
+namespace webkit {
+namespace ppapi {
+struct PluginInfo;
+}
+}
+
 namespace content {
 
 class ContentBrowserClient;
@@ -66,7 +71,8 @@
   virtual void SetGpuInfo(const GPUInfo& gpu_info) = 0;
 
   // Gives the embedder a chance to register its own pepper plugins.
-  virtual void AddPepperPlugins(std::vector<PepperPluginInfo>* plugins) = 0;
+  virtual void AddPepperPlugins(
+      std::vector<webkit::ppapi::PluginInfo>* plugins) = 0;
 
   // Returns whether the given message should be allowed to be sent from a
   // swapped out renderer.