[DevTools] Move target-related methods from DevToolsHttpHandlerDelegate to DevToolsManagerDelegate.

extensions/shell/browser/shell_content_browser_client.cc

Index: extensions/shell/browser/shell_content_browser_client.cc
diff --git a/extensions/shell/browser/shell_content_browser_client.cc b/extensions/shell/browser/shell_content_browser_client.cc
index 3fb07f552b308886092dfec8fbb62d90573ce4b0..e4df6fb5c20a4261e6f7ca93c7a7f4a417528861 100644
--- a/extensions/shell/browser/shell_content_browser_client.cc
+++ b/extensions/shell/browser/shell_content_browser_client.cc
@@ -11,6 +11,7 @@
 #include "content/public/common/content_switches.h"
 #include "content/public/common/url_constants.h"
 #include "content/shell/browser/shell_browser_context.h"
+#include "content/shell/browser/shell_devtools_delegate.h"
 #include "extensions/browser/extension_message_filter.h"
 #include "extensions/browser/extension_protocols.h"
 #include "extensions/browser/extension_registry.h"
@@ -244,4 +245,9 @@ const Extension* ShellContentBrowserClient::GetExtension(
       site_instance->GetSiteURL());
 }
 
+content::DevToolsManagerDelegate*
+ShellContentBrowserClient::GetDevToolsManagerDelegate() {
+  return new content::ShellDevToolsManagerDelegate(GetBrowserContext());
+}
+
 }  // namespace extensions