Remove unsafe mode to enable es3 api by default for WebGL2 and ES3 context

gpu/command_buffer/tests/gl_map_buffer_range_unittest.cc

 // Copyright 2016 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 <GLES2/gl2.h>
 #include <GLES2/gl2ext.h>
 #include <GLES2/gl2extchromium.h>
 #include <GLES3/gl3.h>
 #include <stdint.h>
 
@@ skipping 12 matching lines @@
 class ES3MapBufferRangeTest : public testing::Test {
  protected:
   static const GLsizei kCanvasSize = 4;
 
   void SetUp() override {
     GLManager::Options options;
     options.size = gfx::Size(kCanvasSize, kCanvasSize);
     options.context_type = gles2::CONTEXT_TYPE_OPENGLES3;
 
     base::CommandLine cmd_line(base::CommandLine::NO_PROGRAM);
-    cmd_line.AppendSwitch(switches::kEnableUnsafeES3APIs);
     gl_.InitializeWithCommandLine(options, cmd_line);
   }
 
   bool ShouldSkipTest() const {
     // If a driver isn't capable of supporting ES3 context, creating
     // ContextGroup will fail.
     // See crbug.com/654709.
     return (!gl_.decoder() || !gl_.decoder()->GetContextGroup());
   }
 
@@ skipping 428 matching lines @@
 
   glUnmapBuffer(GL_TRANSFORM_FEEDBACK_BUFFER);
   GLTestHelper::CheckGLError("no errors", __LINE__);
 }
 
 // TODO(zmo): add tests for uniform buffer mapping.
 
 // TODO(zmo): add tests for CopyBufferSubData case.
 
 }  // namespace gpu