gpu: Remove WebGraphicsContext3D::makeContextCurrent() in Blink

Source/platform/graphics/Canvas2DLayerBridge.cpp

Index: Source/platform/graphics/Canvas2DLayerBridge.cpp
diff --git a/Source/platform/graphics/Canvas2DLayerBridge.cpp b/Source/platform/graphics/Canvas2DLayerBridge.cpp
index f88c27805e4cc712875e7739b143abb1300888af..e5fd47edd20a7ef2218c4292af22032cadc6644d 100644
--- a/Source/platform/graphics/Canvas2DLayerBridge.cpp
+++ b/Source/platform/graphics/Canvas2DLayerBridge.cpp
@@ -222,7 +222,6 @@ void Canvas2DLayerBridge::prepareForDraw()
         }
         return;
     }
-    context()->makeContextCurrent();
 }
 
 void Canvas2DLayerBridge::storageAllocatedForRecordingChanged(size_t bytesAllocated)
@@ -408,7 +407,6 @@ bool Canvas2DLayerBridge::prepareMailbox(WebExternalTextureMailbox* outMailbox,
     // Release to skia textures that were previouosly released by the
     // compositor. We do this before acquiring the next snapshot in
     // order to cap maximum gpu memory consumption.
-    webContext->makeContextCurrent();
     flush();
 
     RefPtr<SkImage> image = adoptRef(m_canvas->newImageSnapshot());