gpu: Remove WebGraphicsContext3D::makeContextCurrent() in Blink

Source/platform/graphics/gpu/Extensions3DUtil.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 #include "platform/graphics/gpu/Extensions3DUtil.h"
 
 #include "public/platform/WebGraphicsContext3D.h"
 #include "wtf/text/CString.h"
 #include "wtf/text/StringHash.h"
@@ skipping 24 matching lines @@
     : m_context(context)
 {
 }
 
 Extensions3DUtil::~Extensions3DUtil()
 {
 }
 
 bool Extensions3DUtil::initializeExtensions()
 {
-    if (!m_context->makeContextCurrent()) {
-        // Most likely the GPU process exited and the attempt to reconnect to it failed.
-        // Need to try to restore the context again later.
-        return false;
-    }
-
     if (m_context->isContextLost()) {
         // Need to try to restore the context again later.
         return false;
     }
 
     String extensionsString = m_context->getString(GL_EXTENSIONS);
     splitStringHelper(extensionsString, m_enabledExtensions);
 
     String requestableExtensionsString = m_context->getRequestableExtensionsCHROMIUM();
     splitStringHelper(requestableExtensionsString, m_requestableExtensions);
@@ skipping 31 matching lines @@
     // FIXME: restriction of (RGB || RGBA)/UNSIGNED_BYTE/(Level 0) should be lifted when
     // WebGraphicsContext3D::copyTextureCHROMIUM(...) are fully functional.
     if ((destFormat == GL_RGB || destFormat == GL_RGBA)
         && destType == GL_UNSIGNED_BYTE
         && !level)
         return true;
     return false;
 }
 
 } // namespace blink