Remove SharedBuffer::unlock() and keep Resource's SharedBuffer always locked

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

Index: third_party/WebKit/Source/core/fetch/Resource.h
diff --git a/third_party/WebKit/Source/core/fetch/Resource.h b/third_party/WebKit/Source/core/fetch/Resource.h
index 471249d76b8b0c592d62abc1705f79024817585b..df41fc68d6ff9108604e8d147aabc47b47f05e63 100644
--- a/third_party/WebKit/Source/core/fetch/Resource.h
+++ b/third_party/WebKit/Source/core/fetch/Resource.h
@@ -221,9 +221,6 @@ public:
     double freshnessLifetime();
     double stalenessLifetime();
 
-    bool isPurgeable() const;
-    bool lock();
-
     void setCacheIdentifier(const String& cacheIdentifier) { m_cacheIdentifier = cacheIdentifier; }
     String cacheIdentifier() const { return m_cacheIdentifier; }
 
@@ -280,7 +277,6 @@ protected:
     };
     const Vector<RedirectPair>& redirectChain() const { return m_redirectChain; }
 
-    virtual bool isSafeToUnlock() const { return false; }
     virtual void destroyDecodedDataIfPossible() { }
 
     virtual void markClientsAndObserversFinished();
@@ -309,8 +305,6 @@ private:
 
     size_t calculateOverheadSize() const;
 
-    bool unlock();
-
     String reasonNotDeletable() const;
 
     Member<CachedMetadataHandlerImpl> m_cacheHandler;