Make WebGL2 objects Oilpan compatible.

Source/core/html/canvas/WebGLSampler.cpp

Index: Source/core/html/canvas/WebGLSampler.cpp
diff --git a/Source/core/html/canvas/WebGLSampler.cpp b/Source/core/html/canvas/WebGLSampler.cpp
index 211c2e3f2bef60964f3e8af99ee61879f4c65bf1..d03c65f1205ac8556a9e18ea799ea653746c6fce 100644
--- a/Source/core/html/canvas/WebGLSampler.cpp
+++ b/Source/core/html/canvas/WebGLSampler.cpp
@@ -17,7 +17,14 @@ PassRefPtrWillBeRawPtr<WebGLSampler> WebGLSampler::create(WebGL2RenderingContext
 
 WebGLSampler::~WebGLSampler()
 {
-    deleteObject(0);
+    // Always call detach here to ensure that platform object deletion
+    // happens with Oilpan enabled. It keeps the code regular to do it
+    // with or without Oilpan enabled.
+    //
+    // See comment in WebGLBuffer's destructor for additional
+    // information on why this is done for WebGLSharedObject-derived
+    // objects.
+    detachAndDeleteObject();
 }
 
 WebGLSampler::WebGLSampler(WebGL2RenderingContextBase* ctx)