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
bool RenderView::runModalPromptDialog(
    WebFrame* frame, const WebString& message, const WebString& default_value,
    WebString* actual_value) {
  string16 result;
  bool ok = RunJavaScriptMessage(ui::MessageBoxFlags::kIsJavascriptPrompt,
                                 message,
                                 default_value,
                                 frame->document().url(),
                                 &result);
  if (ok)
    actual_value->assign(result);
  return ok;
}

bool RenderView::runModalPromptDialog(
    WebFrame* frame, const WebString& message, const WebString& default_value,
    WebString* actual_value) {
  string16 result;
  bool ok = RunJavaScriptMessage(ui::MessageBoxFlags::kIsJavascriptPrompt,
                                 message,
                                 default_value,
                                 frame->document().url(),
                                 &result);
  if (ok)
    actual_value->assign(result);
  return ok;
}
