Don't change Document load progress in any page dismissal events.

This can confuse the logic for blocking modal dialogs.

BUG=536652

Review URL: https://codereview.chromium.org/1373113002

Cr-Commit-Position: refs/heads/master@{#351419}
void Document::didLoadAllScriptBlockingResources()
{
    Platform::current()->currentThread()->scheduler()->loadingTaskRunner()->postTask(
        FROM_HERE, m_executeScriptsWaitingForResourcesTask->cancelAndCreate());

    if (frame())
        frame()->loader().client()->didRemoveAllPendingStylesheet();

    if (m_gotoAnchorNeededAfterStylesheetsLoad && view())
        view()->processUrlFragment(m_url);
}

void Document::didLoadAllScriptBlockingResources()
{
    Platform::current()->currentThread()->scheduler()->loadingTaskRunner()->postTask(
        FROM_HERE, m_executeScriptsWaitingForResourcesTask->cancelAndCreate());

    if (frame())
        frame()->loader().client()->didRemoveAllPendingStylesheet();

    if (m_gotoAnchorNeededAfterStylesheetsLoad && view())
        view()->processUrlFragment(m_url);
}
