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

content/browser/devtools/devtools_http_handler_unittest.cc

Index: content/browser/devtools/devtools_http_handler_unittest.cc
diff --git a/content/browser/devtools/devtools_http_handler_unittest.cc b/content/browser/devtools/devtools_http_handler_unittest.cc
index 16c820c063e046b944dec6d29aed795c6122382e..c0e65892805b5da1146f6c98651031b927e30267 100644
--- a/content/browser/devtools/devtools_http_handler_unittest.cc
+++ b/content/browser/devtools/devtools_http_handler_unittest.cc
@@ -86,18 +86,6 @@ class DummyDelegate : public DevToolsHttpHandlerDelegate {
     return base::FilePath();
   }
 
-  virtual std::string GetPageThumbnailData(const GURL& url) OVERRIDE {
-    return std::string();
-  }
-
-  virtual scoped_ptr<DevToolsTarget> CreateNewTarget(const GURL& url) OVERRIDE {
-    return scoped_ptr<DevToolsTarget>();
-  }
-
-  virtual void EnumerateTargets(TargetCallback callback) OVERRIDE {
-    callback.Run(TargetList());
-  }
-
   virtual scoped_ptr<net::StreamListenSocket> CreateSocketForTethering(
       net::StreamListenSocket::Delegate* delegate,
       std::string* name) OVERRIDE {