Whitelist unreachable webdata pages for content settings

BUG=125488
TEST=disable JS, go to https://no.such.host/. Should show a regular error page
NOTRY=true

Review URL: https://chromiumcodereview.appspot.com/10412053

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@138464 0039d316-1c4b-4281-b951-d872f2087c98

chrome/renderer/content_settings_observer.cc

@@ -319,6 +319,9 @@ bool ContentSettingsObserver::IsWhitelistedForContentSettings(WebFrame* frame) {
 bool ContentSettingsObserver::IsWhitelistedForContentSettings(
     const WebSecurityOrigin& origin,
     const GURL& document_url) {
+  if (document_url == GURL(content::kUnreachableWebDataURL))
+    return true;
+
   if (origin.isUnique())
     return false;  // Uninitialized document?
 

content/public/common/url_constants.h

@@ -60,7 +60,7 @@ namespace content {
 CONTENT_EXPORT extern const char kStandardSchemeSeparator[];
 
 // Special URL used to start a navigation to an error page.
-extern const char kUnreachableWebDataURL[];
+CONTENT_EXPORT extern const char kUnreachableWebDataURL[];
 
 // Special URL used to swap out a view being rendered by another process.
 extern const char kSwappedOutURL[];