Fix crash in Extension::GetBrowserImages()

chrome/common/extensions/extension.cc

Index: chrome/common/extensions/extension.cc
diff --git a/chrome/common/extensions/extension.cc b/chrome/common/extensions/extension.cc
index f042c988ef4d6158bd44f2c49a9bb95d9b5d4642..1b3e947a1b50a4fadc104b8175c0f88978ceaca4 100644
--- a/chrome/common/extensions/extension.cc
+++ b/chrome/common/extensions/extension.cc
@@ -3243,7 +3243,7 @@ std::set<FilePath> Extension::GetBrowserImages() const {
     }
   }
 
-  if (page_action()) {
+  if (page_action() && page_action()->default_icon()) {
     for (ExtensionIconSet::IconMap::const_iterator iter =
              page_action()->default_icon()->map().begin();
          iter != page_action()->default_icon()->map().end();
@@ -3252,7 +3252,7 @@ std::set<FilePath> Extension::GetBrowserImages() const {
     }
   }
 
-  if (browser_action()) {
+  if (browser_action() && browser_action()->default_icon()) {
     for (ExtensionIconSet::IconMap::const_iterator iter =
              browser_action()->default_icon()->map().begin();
          iter != browser_action()->default_icon()->map().end();