[SharedArrayBuffer] Prevent SharedArrayBuffer being used in Web APIs

third_party/WebKit/Source/modules/canvas2d/BaseRenderingContext2D.cpp

Index: third_party/WebKit/Source/modules/canvas2d/BaseRenderingContext2D.cpp
diff --git a/third_party/WebKit/Source/modules/canvas2d/BaseRenderingContext2D.cpp b/third_party/WebKit/Source/modules/canvas2d/BaseRenderingContext2D.cpp
index 9653160eccf6da95850252b47b4b17683b287e83..ccc37beb6c94aff6a8f6b76a39693d9444826d36 100644
--- a/third_party/WebKit/Source/modules/canvas2d/BaseRenderingContext2D.cpp
+++ b/third_party/WebKit/Source/modules/canvas2d/BaseRenderingContext2D.cpp
@@ -9,6 +9,7 @@
 #include "bindings/core/v8/ScriptState.h"
 #include "core/css/cssom/CSSURLImageValue.h"
 #include "core/css/parser/CSSParser.h"
+#include "core/dom/NotShared.h"
 #include "core/frame/ImageBitmap.h"
 #include "core/html/HTMLCanvasElement.h"
 #include "core/html/HTMLImageElement.h"
@@ -1612,9 +1613,10 @@ ImageData* BaseRenderingContext2D::getImageData(
   NeedsFinalizeFrame();
 
   DOMArrayBuffer* array_buffer = DOMArrayBuffer::Create(contents);
-  return ImageData::Create(image_data_rect.size(),
-                           DOMUint8ClampedArray::Create(
-                               array_buffer, 0, array_buffer->ByteLength()));
+  return ImageData::Create(
+      image_data_rect.size(),
+      NotShared<DOMUint8ClampedArray>(DOMUint8ClampedArray::Create(
+          array_buffer, 0, array_buffer->ByteLength())));
 }
 
 void BaseRenderingContext2D::putImageData(ImageData* data,