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

gpu/command_buffer/service/gles2_cmd_decoder.h

 // Copyright (c) 2012 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.
 
 // This file contains the GLES2Decoder class.
 
 #ifndef GPU_COMMAND_BUFFER_SERVICE_GLES2_CMD_DECODER_H_
 #define GPU_COMMAND_BUFFER_SERVICE_GLES2_CMD_DECODER_H_
 
 #include <stdint.h>
@@ skipping 97 matching lines @@
   ~GLES2Decoder() override;
 
   bool initialized() const {
     return initialized_;
   }
 
   void set_initialized() {
     initialized_ = true;
   }
 
-  bool unsafe_es3_apis_enabled() const {
-    return unsafe_es3_apis_enabled_;
+  bool es3_apis_enabled() const {
+    return es3_apis_enabled_;
   }
 
-  void set_unsafe_es3_apis_enabled(bool enabled) {
-    unsafe_es3_apis_enabled_ = enabled;
+  void set_es3_apis_enabled(bool enabled) {
+    es3_apis_enabled_ = enabled;
   }
 
   bool debug() const {
     return debug_;
   }
 
   // Set to true to call glGetError after every command.
   void set_debug(bool debug) {
     debug_ = debug;
   }
@@ skipping 207 matching lines @@
   // of commands at once, and is now only used for tests that need to track
   // individual commands.
   error::Error DoCommand(unsigned int command,
                          unsigned int arg_count,
                          const volatile void* cmd_data) override;
 
  private:
   bool initialized_;
   bool debug_;
   bool log_commands_;
-  bool unsafe_es3_apis_enabled_;
+  bool es3_apis_enabled_;
   DISALLOW_COPY_AND_ASSIGN(GLES2Decoder);
 };
 
 }  // namespace gles2
 }  // namespace gpu
 
 #endif  // GPU_COMMAND_BUFFER_SERVICE_GLES2_CMD_DECODER_H_