Blink GC plugin: look for checked namespaces within the list of namespaces.

tools/clang/blink_gc_plugin/BlinkGCPlugin.cpp

 // Copyright 2014 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.
 
 // This clang plugin checks various invariants of the Blink garbage
 // collection infrastructure.
 //
 // Errors are described at:
 // http://www.chromium.org/developers/blink-gc-plugin-errors
 
@@ skipping 1042 matching lines @@
         return true;
     return false;
   }
 
   bool InCheckedNamespace(RecordInfo* info) {
     if (!info)
       return false;
     DeclContext* context = info->record()->getDeclContext();
     if (context->isRecord())
       return InCheckedNamespace(cache_.Lookup(context));
-    if (context->isNamespace()) {
-      const NamespaceDecl* decl = dyn_cast<NamespaceDecl>(context);
+    while (context->isNamespace()) {
+      NamespaceDecl* decl = dyn_cast<NamespaceDecl>(context);
       if (decl->isAnonymousNamespace())
         return false;
-      return options_.checked_namespaces.find(decl->getNameAsString()) !=
-          options_.checked_namespaces.end();
+      if (options_.checked_namespaces.find(decl->getNameAsString()) !=
+          options_.checked_namespaces.end())
+        return true;
+      context = decl->getDeclContext();
     }
     return false;
   }
 
   bool GetFilename(SourceLocation loc, string* filename) {
     const SourceManager& source_manager = instance_.getSourceManager();
     SourceLocation spelling_location = source_manager.getSpellingLoc(loc);
     PresumedLoc ploc = source_manager.getPresumedLoc(spelling_location);
     if (ploc.isInvalid()) {
       // If we're in an invalid location, we're looking at things that aren't
@@ skipping 350 matching lines @@
 
  private:
   BlinkGCPluginOptions options_;
 };
 
 }  // namespace
 
 static FrontendPluginRegistry::Add<BlinkGCPluginAction> X(
     "blink-gc-plugin",
     "Check Blink GC invariants");