Checks to enforce relative lifetimes for SdchManager.

net/url_request/url_request_context.h

Index: net/url_request/url_request_context.h
diff --git a/net/url_request/url_request_context.h b/net/url_request/url_request_context.h
index 992f985f0332b441af1c21614e27a5c48974cd4f..a0e15dc9910b21cca573d66181becf9cd51be026 100644
--- a/net/url_request/url_request_context.h
+++ b/net/url_request/url_request_context.h
@@ -20,6 +20,7 @@
 #include "net/base/net_export.h"
 #include "net/base/net_log.h"
 #include "net/base/request_priority.h"
+#include "net/base/sdch_manager.h"
 #include "net/http/http_network_session.h"
 #include "net/http/http_server_properties.h"
 #include "net/http/transport_security_state.h"
@@ -186,10 +187,15 @@ class NET_EXPORT URLRequestContext
 
   // May be NULL.
   SdchManager* sdch_manager() const {
-    return sdch_manager_;
+    // For investigation of http://crbug.com/454198; remove ?: when resolved.
+    CHECK(!have_sdch_manager_ || sdch_manager_.get());
+    return have_sdch_manager_ ? sdch_manager_.get() : NULL;
   }
   void set_sdch_manager(SdchManager* sdch_manager) {
-    sdch_manager_ = sdch_manager;
+    // For investigation of http://crbug.com/454198; simplify when resolved.
+    have_sdch_manager_ = !!sdch_manager;
+    if (have_sdch_manager_)
+      sdch_manager_ = sdch_manager->GetWeakPtr();
   }
 
   // Gets the URLRequest objects that hold a reference to this
@@ -238,7 +244,9 @@ class NET_EXPORT URLRequestContext
   HttpTransactionFactory* http_transaction_factory_;
   const URLRequestJobFactory* job_factory_;
   URLRequestThrottlerManager* throttler_manager_;
-  SdchManager* sdch_manager_;
+  // For investigation of http://crbug.com/454198; remove WeakPtr when resolved.
+  bool have_sdch_manager_;
+  base::WeakPtr<SdchManager> sdch_manager_;
 
   // ---------------------------------------------------------------------------
   // Important: When adding any new members below, consider whether they need to