Remove dependency on the DevTools agent for console logs.

content/renderer/devtools/devtools_agent.h

Index: content/renderer/devtools/devtools_agent.h
diff --git a/content/renderer/devtools/devtools_agent.h b/content/renderer/devtools/devtools_agent.h
index 4ae5d7f5b4d72086b7dac08b8f82634a1342de53..7fc1d06bea5389844ccd49b811929b77ce1d98aa 100644
--- a/content/renderer/devtools/devtools_agent.h
+++ b/content/renderer/devtools/devtools_agent.h
@@ -11,7 +11,6 @@
 #include "base/callback.h"
 #include "base/macros.h"
 #include "content/common/content_export.h"
-#include "content/public/common/console_message_level.h"
 #include "content/public/renderer/render_frame_observer.h"
 #include "third_party/WebKit/public/web/WebDevToolsAgentClient.h"
 
@@ -48,9 +47,6 @@ class CONTENT_EXPORT DevToolsAgent
 
   bool IsAttached();
 
-  void AddMessageToConsole(ConsoleMessageLevel level,
-                           const std::string& message);
-
  private:
   friend class DevToolsAgentTest;