Fix content scripts that use WebGL.

third_party/WebKit/Source/modules/webgl/WebGLRenderingContextBase.h

Index: third_party/WebKit/Source/modules/webgl/WebGLRenderingContextBase.h
diff --git a/third_party/WebKit/Source/modules/webgl/WebGLRenderingContextBase.h b/third_party/WebKit/Source/modules/webgl/WebGLRenderingContextBase.h
index f6738b88b58248e6ae101cf6b1e65dac499bdb38..1a98dc8ba87f00069983f185e11a4dcafe44900b 100644
--- a/third_party/WebKit/Source/modules/webgl/WebGLRenderingContextBase.h
+++ b/third_party/WebKit/Source/modules/webgl/WebGLRenderingContextBase.h
@@ -27,10 +27,10 @@
 #define WebGLRenderingContextBase_h
 
 #include "bindings/core/v8/Nullable.h"
-#include "bindings/core/v8/ScopedPersistent.h"
 #include "bindings/core/v8/ScriptState.h"
 #include "bindings/core/v8/ScriptValue.h"
 #include "bindings/core/v8/ScriptWrappable.h"
+#include "bindings/core/v8/V8PrivateProperty.h"
 #include "core/CoreExport.h"
 #include "core/dom/DOMTypedArray.h"
 #include "core/dom/TypedFlexibleArrayBufferView.h"
@@ -1036,16 +1036,6 @@ protected:
 
     virtual void renderbufferStorageImpl(GLenum target, GLsizei samples, GLenum internalformat, GLsizei width, GLsizei height, const char* functionName);
 
-    // Ensures that the JavaScript wrappers for objects that are
-    // latched into the context's state, or which are implicitly
-    // linked together (like programs and their attached shaders), are
-    // not garbage collected before they should be.
-    ScopedPersistent<v8::Array> m_2DTextureWrappers;
-    ScopedPersistent<v8::Array> m_2DArrayTextureWrappers;
-    ScopedPersistent<v8::Array> m_3DTextureWrappers;
-    ScopedPersistent<v8::Array> m_cubeMapTextureWrappers;
-    ScopedPersistent<v8::Array> m_extensionWrappers;
-
     // The "catch-all" array for the rest of the preserved object
     // wrappers. The enum below defines how the indices in this array
     // are used.
@@ -1059,9 +1049,8 @@ protected:
         PreservedVAO,
         PreservedTransformFeedback,
     };
-    ScopedPersistent<v8::Array> m_miscWrappers;
 
-    static void preserveObjectWrapper(ScriptState*, ScriptWrappable* sourceObject, v8::Local<v8::String> hiddenValueName, ScopedPersistent<v8::Array>* persistentCache, uint32_t index, ScriptWrappable* targetObject);
+    static void preserveObjectWrapper(ScriptState*, ScriptWrappable* sourceObject, const V8PrivateProperty::Symbol& privateSymbol, uint32_t index, ScriptWrappable* targetObject);
 
     // Called to lazily instantiate the wrapper for the default VAO
     // during calls to bindBuffer and vertexAttribPointer (from