Revert of DevTools: android shouldn't depend on devtools frontend

content/shell/browser/shell_devtools_frontend.h

Index: content/shell/browser/shell_devtools_frontend.h
diff --git a/content/shell/browser/shell_devtools_frontend.h b/content/shell/browser/shell_devtools_frontend.h
index 42f5c64074ff5778f415e0a98357c46e1ea5f2ed..cd4f3b5acba01ce471dbad780560b6bc9f36db56 100644
--- a/content/shell/browser/shell_devtools_frontend.h
+++ b/content/shell/browser/shell_devtools_frontend.h
@@ -13,12 +13,9 @@
 #include "base/memory/weak_ptr.h"
 #include "base/values.h"
 #include "content/public/browser/devtools_agent_host.h"
+#include "content/public/browser/devtools_frontend_host.h"
 #include "content/public/browser/web_contents_observer.h"
 #include "net/url_request/url_fetcher_delegate.h"
-
-#if !defined(OS_ANDROID)
-#include "content/public/browser/devtools_frontend_host.h"
-#endif
 
 namespace base {
 class Value;
@@ -78,9 +75,7 @@
   scoped_refptr<DevToolsAgentHost> agent_host_;
   int inspect_element_at_x_;
   int inspect_element_at_y_;
-#if !defined(OS_ANDROID)
   std::unique_ptr<DevToolsFrontendHost> frontend_host_;
-#endif
   using PendingRequestsMap = std::map<const net::URLFetcher*, int>;
   PendingRequestsMap pending_requests_;
   base::DictionaryValue preferences_;