Rewrite BrowserTest.PageLanguageDetection to use a new tab instead of the one with about:blank.

chrome/renderer/chrome_render_view_observer.cc

Index: chrome/renderer/chrome_render_view_observer.cc
diff --git a/chrome/renderer/chrome_render_view_observer.cc b/chrome/renderer/chrome_render_view_observer.cc
index 3ae0ce6da29ef33c8c3d137a53bfdf4c0b3d05d2..98f6c7361bd57db295109e594ade7f950df42d67 100644
--- a/chrome/renderer/chrome_render_view_observer.cc
+++ b/chrome/renderer/chrome_render_view_observer.cc
@@ -505,9 +505,9 @@ void ChromeRenderViewObserver::CapturePageInfo(int load_id,
   // Retrieve the frame's full text.
   string16 contents;
   CaptureText(main_frame, &contents);
+  if (translate_helper_)
+    translate_helper_->PageCaptured(contents);
   if (contents.size()) {
-    if (translate_helper_)
-      translate_helper_->PageCaptured(contents);
     // Send the text to the browser for indexing (the browser might decide not
     // to index, if the URL is HTTPS for instance) and language discovery.
     Send(new ViewHostMsg_PageContents(routing_id(), url, load_id, contents));