content: Rename webkit_test_helpers.{cc,h} to blink_test_helpers.{cc,h}

Now that webkit/ is gone, we are preparing ourselves for the merge of
third_party/WebKit into //blink.

BUG=None
BUG=content_shell && content_unittests
R=avi@chromium.org

Review URL: https://codereview.chromium.org/1118183003

Cr-Commit-Position: refs/heads/master@{#328202}
void BlinkTestRunner::SetPermission(const std::string& name,
                                    const std::string& value,
                                    const GURL& origin,
                                    const GURL& embedding_origin) {
  content::PermissionStatus status;
  if (value == "granted")
    status = PERMISSION_STATUS_GRANTED;
  else if (value == "prompt")
    status = PERMISSION_STATUS_ASK;
  else if (value == "denied")
    status = PERMISSION_STATUS_DENIED;
  else {
    NOTREACHED();
    status = PERMISSION_STATUS_DENIED;
  }

  Send(new LayoutTestHostMsg_SetPermission(
      routing_id(), name, status, origin, embedding_origin));
}

void BlinkTestRunner::SetPermission(const std::string& name,
                                    const std::string& value,
                                    const GURL& origin,
                                    const GURL& embedding_origin) {
  content::PermissionStatus status;
  if (value == "granted")
    status = PERMISSION_STATUS_GRANTED;
  else if (value == "prompt")
    status = PERMISSION_STATUS_ASK;
  else if (value == "denied")
    status = PERMISSION_STATUS_DENIED;
  else {
    NOTREACHED();
    status = PERMISSION_STATUS_DENIED;
  }

  Send(new LayoutTestHostMsg_SetPermission(
      routing_id(), name, status, origin, embedding_origin));
}
