[webcrypto] Remove the mock implementation of WebCrypto.

content/shell/renderer/shell_content_renderer_client.cc

Index: content/shell/renderer/shell_content_renderer_client.cc
diff --git a/content/shell/renderer/shell_content_renderer_client.cc b/content/shell/renderer/shell_content_renderer_client.cc
index 8569a09a71201e35a312d8aa1ba23b3d19bf85e3..68778b731b9d5d03a88bda06fc9aa76ca109fb45 100644
--- a/content/shell/renderer/shell_content_renderer_client.cc
+++ b/content/shell/renderer/shell_content_renderer_client.cc
@@ -160,14 +160,6 @@ WebClipboard* ShellContentRendererClient::OverrideWebClipboard() {
   return clipboard_.get();
 }
 
-WebKit::WebCrypto* ShellContentRendererClient::OverrideWebCrypto() {
-  if (!CommandLine::ForCurrentProcess()->HasSwitch(switches::kDumpRenderTree))
-    return NULL;
-  WebTestInterfaces* interfaces =
-      ShellRenderProcessObserver::GetInstance()->test_interfaces();
-  return interfaces->crypto();
-}
-
 WebThemeEngine* ShellContentRendererClient::OverrideThemeEngine() {
   if (!CommandLine::ForCurrentProcess()->HasSwitch(switches::kDumpRenderTree))
     return NULL;