Revert of WebGL: Free temporary GPU resources held by inactive or hidden WebGL.

Source/core/html/canvas/WebGLRenderingContextBase.cpp

Index: Source/core/html/canvas/WebGLRenderingContextBase.cpp
diff --git a/Source/core/html/canvas/WebGLRenderingContextBase.cpp b/Source/core/html/canvas/WebGLRenderingContextBase.cpp
index 2017d0cf678be9a6c5bc83c92fb651aa53b8ad2b..a52eb64d68173acf513ef3209fef55b7db695da7 100644
--- a/Source/core/html/canvas/WebGLRenderingContextBase.cpp
+++ b/Source/core/html/canvas/WebGLRenderingContextBase.cpp
@@ -829,12 +829,6 @@
 {
     if (!isContextLost())
         m_drawingBuffer->markLayerComposited();
-}
-
-void WebGLRenderingContextBase::setIsHidden(bool hidden)
-{
-    if (!isContextLost())
-        m_drawingBuffer->setIsHidden(hidden);
 }
 
 void WebGLRenderingContextBase::paintRenderingResultsToCanvas()