Remove a GC_PLUGIN_IGNORE for an issue which has already been fixed.

BUG=516604, 496496

Review URL: https://codereview.chromium.org/1320443005

git-svn-id: svn://svn.chromium.org/blink/trunk@201624 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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

@@ -1080,6 +1080,9 @@ WebGLRenderingContextBase::~WebGLRenderingContextBase()
     m_renderbufferBinding = nullptr;
     m_valuebufferBinding = nullptr;
 
+    // WebGLTexture shared objects will be detached and deleted
+    // m_contextGroup->removeContext(this), which will bring about deleteTexture() calls.
+    // We null these out to avoid accessing those members in deleteTexture().
     for (size_t i = 0; i < m_textureUnits.size(); ++i) {
         m_textureUnits[i].m_texture2DBinding = nullptr;
         m_textureUnits[i].m_textureCubeMapBinding = nullptr;

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

@@ -570,7 +570,6 @@ protected:
     PersistentWillBeMember<WebGLRenderbuffer> m_renderbufferBinding;
     PersistentWillBeMember<CHROMIUMValuebuffer> m_valuebufferBinding;
 
-    GC_PLUGIN_IGNORE("crbug.com/496496")
     PersistentHeapVectorWillBeHeapVector<TextureUnitState> m_textureUnits;
     unsigned long m_activeTextureUnit;