Extract ProcessManager from ExtensionSystem.

chrome/browser/devtools/devtools_target_impl.cc

Index: chrome/browser/devtools/devtools_target_impl.cc
diff --git a/chrome/browser/devtools/devtools_target_impl.cc b/chrome/browser/devtools/devtools_target_impl.cc
index 6ccc73d99fc2d793d5e3d6b6899d43f1adf48adc..23c94112b623b8f11e2e37e98f1ef3bfc3f9e709 100644
--- a/chrome/browser/devtools/devtools_target_impl.cc
+++ b/chrome/browser/devtools/devtools_target_impl.cc
@@ -20,7 +20,6 @@
 #include "content/public/browser/web_contents.h"
 #include "extensions/browser/extension_host.h"
 #include "extensions/browser/extension_registry.h"
-#include "extensions/browser/extension_system.h"
 #include "extensions/browser/guest_view/guest_view_base.h"
 #include "extensions/browser/process_manager.h"
 #include "extensions/common/constants.h"
@@ -107,12 +106,10 @@ WebContentsTarget::WebContentsTarget(WebContents* web_contents, bool is_tab)
       Profile::FromBrowserContext(web_contents->GetBrowserContext());
   if (!profile)
     return;
-  extensions::ExtensionSystem* extension_system =
-      extensions::ExtensionSystem::Get(profile);
   set_title(extension->name());
   extensions::ExtensionHost* extension_host =
-      extension_system->process_manager()->GetBackgroundHostForExtension(
-          extension->id());
+      extensions::ProcessManager::Get(profile)
+          ->GetBackgroundHostForExtension(extension->id());
   if (extension_host &&
       extension_host->host_contents() == web_contents) {
     set_type(kTargetTypeBackgroundPage);