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::OnCut() {
  if (!webview())
    return;

  webview()->focusedFrame()->executeCommand(WebString::fromUTF8("Cut"));
}

void RenderView::OnCut() {
  if (!webview())
    return;

  webview()->focusedFrame()->executeCommand(WebString::fromUTF8("Cut"));
}
