gpu: Remove WebGraphicsContext3D::makeContextCurrent() in Blink

public/platform/WebGraphicsContext3D.h

Index: public/platform/WebGraphicsContext3D.h
diff --git a/public/platform/WebGraphicsContext3D.h b/public/platform/WebGraphicsContext3D.h
index 4d50b6dab76a33bf1e5dc0ccb954b241f2a86e9f..fa877dd7e994c1a329f8e1a8ea0b5d21d8a25c2e 100644
--- a/public/platform/WebGraphicsContext3D.h
+++ b/public/platform/WebGraphicsContext3D.h
@@ -64,12 +64,6 @@ typedef WGC3Duint WebGLId;
 // GraphicsContext3D in order to implement WebGL. Nearly all of the
 // methods exposed on this interface map directly to entry points in
 // the OpenGL ES 2.0 API.
-//
-// Creating a WebGraphicsContext does not make it current, or guarantee
-// that the context has been created successfully. Use
-// makeContextCurrent() to complete initialization of the context, treating
-// a false return value as indication that the context could not be created
-// successfully.
 class WebGraphicsContext3D : public WebNonCopyable {
 public:
     // Return value from getActiveUniform and getActiveAttrib.
@@ -144,10 +138,6 @@ public:
     // This destructor needs to be public so that using classes can destroy instances if initialization fails.
     virtual ~WebGraphicsContext3D() { }
 
-    // Makes the OpenGL context current on the current thread. Returns true on
-    // success.
-    virtual bool makeContextCurrent() = 0;
-
     // Each flush or finish is assigned an unique ID. The larger
     // the ID number, the more recently the context has been flushed.
     virtual uint32_t lastFlushID() { return 0; }