Checks to enforce relative lifetimes for SdchManager.

net/base/sdch_manager.h

Index: net/base/sdch_manager.h
diff --git a/net/base/sdch_manager.h b/net/base/sdch_manager.h
index c83d3a41ce59263466b7928eda2b3788bfde5ccb..93f8a74b61bcf71d0fab24b8e7a395f573929fa1 100644
--- a/net/base/sdch_manager.h
+++ b/net/base/sdch_manager.h
@@ -23,6 +23,7 @@
 #include "base/gtest_prod_util.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
+#include "base/memory/weak_ptr.h"
 #include "base/observer_list.h"
 #include "base/threading/thread_checker.h"
 #include "base/time/time.h"
@@ -292,6 +293,9 @@ class NET_EXPORT SdchManager {
 
   static scoped_ptr<DictionarySet> CreateEmptyDictionarySetForTesting();
 
+  // For investigation of http://crbug.com/454198; remove when resolved.
+  base::WeakPtr<SdchManager> GetWeakPtr();
+
  private:
   struct BlacklistInfo {
     BlacklistInfo() : count(0), exponential_count(0), reason(SDCH_OK) {}
@@ -338,6 +342,8 @@ class NET_EXPORT SdchManager {
 
   base::ThreadChecker thread_checker_;
 
+  base::WeakPtrFactory<SdchManager> factory_;
+
   DISALLOW_COPY_AND_ASSIGN(SdchManager);
 };