Do V8 GC ASAP if system memory is pressured

net/sdch/sdch_owner.cc

Index: net/sdch/sdch_owner.cc
diff --git a/net/sdch/sdch_owner.cc b/net/sdch/sdch_owner.cc
index 03e268e1343ddd2f2d0e456e9fadc1270222d5b7..eb35460adf47416bde6fc184c00613827e9bb4f2 100644
--- a/net/sdch/sdch_owner.cc
+++ b/net/sdch/sdch_owner.cc
@@ -296,12 +296,12 @@ SdchOwner::SdchOwner(SdchManager* sdch_manager, URLRequestContext* context)
       clock_(new base::DefaultClock),
       max_total_dictionary_size_(kMaxTotalDictionarySize),
       min_space_for_dictionary_fetch_(kMinSpaceForDictionaryFetch),
-      memory_pressure_listener_(
+      memory_pressure_listener_(base::MemoryPressureListener::Create(
           base::Bind(&SdchOwner::OnMemoryPressure,
                      // Because |memory_pressure_listener_| is owned by
                      // SdchOwner, the SdchOwner object will be available
                      // for the lifetime of |memory_pressure_listener_|.
-                     base::Unretained(this))),
+                     base::Unretained(this)))),
       in_memory_pref_store_(new ValueMapPrefStorage()),
       external_pref_store_(nullptr),
       pref_store_(in_memory_pref_store_.get()),