Print Preview: Detecting plugin existence before generating the preview.

chrome/browser/ui/webui/print_preview_ui_html_source.cc

Index: chrome/browser/ui/webui/print_preview_ui_html_source.cc
diff --git a/chrome/browser/ui/webui/print_preview_ui_html_source.cc b/chrome/browser/ui/webui/print_preview_ui_html_source.cc
index be4b583b5190583bb94e9ab2cc247e53f21d8651..d95b6412de5bfe0704b2925b4cea5f193abed202 100644
--- a/chrome/browser/ui/webui/print_preview_ui_html_source.cc
+++ b/chrome/browser/ui/webui/print_preview_ui_html_source.cc
@@ -160,6 +160,11 @@ void PrintPreviewUIHTMLSource::StartDataRequest(const std::string& path,
       *it = *(preview_data + i);
     SendResponse(request_id, html_bytes);
     return;
+  } else if (path == "blank.pdf") {
+    scoped_refptr<RefCountedStaticMemory> blank_bytes(
+        new RefCountedStaticMemory());
+    SendResponse(request_id, blank_bytes);
+    return;
   } else {
     // Invalid request.
     scoped_refptr<RefCountedBytes> empty_bytes(new RefCountedBytes);