Support "Report Issue" in case of no-browser windows in ChromeOS.

chrome/browser/ui/webui/feedback_ui.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/ui/webui/feedback_ui.h"
 
 #include <vector>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ skipping 368 matching lines @@
             &query_str, 0, kTimestampParameter, "");
         timestamp_ = query_str;
         continue;
       }
 #endif
     }
   }
 
   // If we don't have a page url specified, get it from the tab index.
   if (custom_page_url.empty()) {
-    if (session_id == -1 || index == -1)
+    if (session_id == -1)
       return false;
 
     Browser* browser = browser::FindBrowserWithID(session_id);
     // Sanity checks.
     if (!browser || index >= browser->tab_count())
       return false;
 
-    WebContents* target_tab = chrome::GetWebContentsAt(browser, index);
-    if (target_tab)
-      target_tab_url_ = target_tab->GetURL().spec();
+    if (index >= 0) {
+      WebContents* target_tab = chrome::GetWebContentsAt(browser, index);
+      if (target_tab)
+        target_tab_url_ = target_tab->GetURL().spec();
+    }
 
     // Note: We don't need to setup a screenshot source if we're using a
     // custom page URL since we were invoked from JS/an extension, in which
     // case we don't actually have a screenshot anyway.
     SetupScreenshotsSource();
   } else {
     target_tab_url_ = custom_page_url;
   }
 
   return true;
@@ skipping 235 matching lines @@
   size_t sort_size = std::min(max_saved, screenshot_filepaths.size());
   std::partial_sort(screenshot_filepaths.begin(),
                     screenshot_filepaths.begin() + sort_size,
                     screenshot_filepaths.end(),
                     ScreenshotTimestampComp);
   for (size_t i = 0; i < sort_size; ++i)
     saved_screenshots->push_back(std::string(kSavedScreenshotsUrl) +
                                    screenshot_filepaths[i]);
 }
 #endif