Print Preview: Fix crash in PrepareFrameAndViewForPrint.

BUG=90887
TEST=Find a way to trigger a print preview generation failure, then reload the print preview tab.

Review URL: http://codereview.chromium.org/7577001

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@95471 0039d316-1c4b-4281-b951-d872f2087c98

chrome/renderer/print_web_view_helper.cc

@@ -507,7 +507,7 @@ void PrintWebViewHelper::DidFinishPrinting(PrintingResult result) {
     store_print_pages_params = false;
     int cookie = print_pages_params_->params.document_cookie;
     Send(new PrintHostMsg_PrintPreviewFailed(routing_id(), cookie));
-    print_preview_context_.Abort();
+    print_preview_context_.Failed();
   } else if (result == ABORT_PREVIEW) {
     DCHECK(is_preview_);
     store_print_pages_params = false;
@@ -1054,6 +1054,12 @@ void PrintWebViewHelper::PrintPreviewContext::Finished() {
   ClearContext();
 }
 
+void PrintWebViewHelper::PrintPreviewContext::Failed() {
+  DCHECK(IsBusy());
+  state_ = INITIALIZED;
+  ClearContext();
+}
+
 void PrintWebViewHelper::PrintPreviewContext::Abort() {
   state_ = UNINITIALIZED;
   ClearContext();

chrome/renderer/print_web_view_helper.h

@@ -331,6 +331,9 @@ class PrintWebViewHelper : public RenderViewObserver,
     // Cleanup after print preview finishes.
     void Finished();
 
+    // Cleanup after print preview fails.
+    void Failed();
+
     // Abort the print preview.
     void Abort();