Add TestExtensionsBrowserClient, move ProcessManagerTest to //extensions

extensions/browser/process_manager.cc

Index: extensions/browser/process_manager.cc
diff --git a/extensions/browser/process_manager.cc b/extensions/browser/process_manager.cc
index 721bc14cb976272c0b1ce30bdcd304a70c8f4959..6298553ebe7cd64742d01e73d6c6690f3cef6ba1 100644
--- a/extensions/browser/process_manager.cc
+++ b/extensions/browser/process_manager.cc
@@ -95,7 +95,8 @@ void OnRenderViewHostUnregistered(BrowserContext* context,
 class IncognitoProcessManager : public ProcessManager {
  public:
   IncognitoProcessManager(BrowserContext* incognito_context,
-                          BrowserContext* original_context);
+                          BrowserContext* original_context,
+                          ProcessManager* original_manager);
   virtual ~IncognitoProcessManager() {}
   virtual bool CreateBackgroundHost(const Extension* extension,
                                     const GURL& url) OVERRIDE;
@@ -189,12 +190,26 @@ ProcessManager* ProcessManager::Create(BrowserContext* context) {
 
   if (context->IsOffTheRecord()) {
     BrowserContext* original_context = client->GetOriginalContext(context);
-    return new IncognitoProcessManager(context, original_context);
+    ProcessManager* original_manager =
+        ExtensionSystem::Get(original_context)->process_manager();
+    return new IncognitoProcessManager(
+        context, original_context, original_manager);
   }
 
   return new ProcessManager(context, context);
 }
 
+// static
+ProcessManager* ProcessManager::CreateIncognitoForTesting(
+    BrowserContext* incognito_context,
+    BrowserContext* original_context,
+    ProcessManager* original_manager) {
+  DCHECK(incognito_context->IsOffTheRecord());
+  DCHECK(!original_context->IsOffTheRecord());
+  return new IncognitoProcessManager(
+      incognito_context, original_context, original_manager);
+}
+
 ProcessManager::ProcessManager(BrowserContext* context,
                                BrowserContext* original_context)
   : site_instance_(SiteInstance::Create(context)),
@@ -861,10 +876,10 @@ bool ProcessManager::DeferLoadingBackgroundHosts() const {
 
 IncognitoProcessManager::IncognitoProcessManager(
     BrowserContext* incognito_context,
-    BrowserContext* original_context)
+    BrowserContext* original_context,
+    ProcessManager* original_manager)
     : ProcessManager(incognito_context, original_context),
-      original_manager_(
-          ExtensionSystem::Get(original_context)->process_manager()) {
+      original_manager_(original_manager) {
   DCHECK(incognito_context->IsOffTheRecord());
 
   // The original profile will have its own ProcessManager to