Extract ProcessManager from ExtensionSystem.

chrome/browser/renderer_context_menu/render_view_context_menu.cc

Index: chrome/browser/renderer_context_menu/render_view_context_menu.cc
diff --git a/chrome/browser/renderer_context_menu/render_view_context_menu.cc b/chrome/browser/renderer_context_menu/render_view_context_menu.cc
index de55523068ff98260f5dabd2297464755ee2c090..7841aa6f3ace8140d943be1b374157edaa0b67d4 100644
--- a/chrome/browser/renderer_context_menu/render_view_context_menu.cc
+++ b/chrome/browser/renderer_context_menu/render_view_context_menu.cc
@@ -627,14 +627,9 @@ void RenderViewContextMenu::AppendPrintPreviewItems() {
 }
 
 const Extension* RenderViewContextMenu::GetExtension() const {
-  extensions::ExtensionSystem* system =
-      extensions::ExtensionSystem::Get(browser_context_);
-  // There is no process manager in some tests.
-  if (!system->process_manager())
-    return NULL;
-
-  return system->process_manager()->GetExtensionForRenderViewHost(
-      source_web_contents_->GetRenderViewHost());
+  return extensions::ProcessManager::Get(browser_context_)
+      ->GetExtensionForRenderViewHost(
+          source_web_contents_->GetRenderViewHost());
 }
 
 void RenderViewContextMenu::AppendDeveloperItems() {