Don't leave a discarded SharedBuffer on Resource

third_party/WebKit/Source/core/fetch/Resource.cpp

Index: third_party/WebKit/Source/core/fetch/Resource.cpp
diff --git a/third_party/WebKit/Source/core/fetch/Resource.cpp b/third_party/WebKit/Source/core/fetch/Resource.cpp
index dbb8562fdd1443bd6c9ea20ac00e11804238bca3..e97b8d34df284ae841b4b065d2802e5474a12d9d 100644
--- a/third_party/WebKit/Source/core/fetch/Resource.cpp
+++ b/third_party/WebKit/Source/core/fetch/Resource.cpp
@@ -890,6 +890,8 @@ bool Resource::lock()
     // If locking fails, our buffer has been purged. There's no point
     // in leaving a purged resource in MemoryCache.
     if (!m_data->lock()) {
+        m_data.clear();
+        setEncodedSize(0);
         memoryCache()->remove(this);
         return false;
     }