DevTools: move DevToolsAgent/Client into content.

BUG=84078
TEST=

Review URL: http://codereview.chromium.org/7461019

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@93596 0039d316-1c4b-4281-b951-d872f2087c98
void RenderView::OnContextMenuClosed(
    const webkit_glue::CustomContextMenuContext& custom_context) {
  if (custom_context.is_pepper_menu)
    pepper_delegate_.OnContextMenuClosed(custom_context);
  else
    context_menu_node_.reset();
}

void RenderView::OnContextMenuClosed(
    const webkit_glue::CustomContextMenuContext& custom_context) {
  if (custom_context.is_pepper_menu)
    pepper_delegate_.OnContextMenuClosed(custom_context);
  else
    context_menu_node_.reset();
}
