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::SetReportLoadProgressEnabled(bool enabled) {
  if (!enabled) {
    load_progress_tracker_.reset(NULL);
    return;
  }
  if (load_progress_tracker_ == NULL)
    load_progress_tracker_.reset(new LoadProgressTracker(this));
}

void RenderView::SetReportLoadProgressEnabled(bool enabled) {
  if (!enabled) {
    load_progress_tracker_.reset(NULL);
    return;
  }
  if (load_progress_tracker_ == NULL)
    load_progress_tracker_.reset(new LoadProgressTracker(this));
}
