Remove unused function on HTMLImportsController.

The showSecurityErrorMessage wasn't called by anything. So I killed it.

R=morrita
BUG=

Review URL: https://codereview.chromium.org/305643009

git-svn-id: svn://svn.chromium.org/blink/trunk@175226 bbb929c8-8fbe-4397-9dbb-9b2b20218538

third_party/WebKit/Source/core/html/imports/HTMLImportsController.cpp

@@ -124,11 +124,6 @@ HTMLImportChild* HTMLImportsController::load(HTMLImport* parent, HTMLImportChild
     return child;
 }
 
-void HTMLImportsController::showSecurityErrorMessage(const String& message)
-{
-    master()->addConsoleMessage(JSMessageSource, ErrorMessageLevel, message);
-}
-
 Document* HTMLImportsController::master() const
 {
     return root()->document();

third_party/WebKit/Source/core/html/imports/HTMLImportsController.h

@@ -65,7 +65,6 @@ public:
     void wasDetachedFrom(const Document&);
 
     HTMLImportChild* load(HTMLImport* parent, HTMLImportChildClient*, FetchRequest);
-    void showSecurityErrorMessage(const String&);
 
     Document* master() const;