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

gpu/command_buffer/service/feature_info.cc

Index: gpu/command_buffer/service/feature_info.cc
diff --git a/gpu/command_buffer/service/feature_info.cc b/gpu/command_buffer/service/feature_info.cc
index d30abaa72f216f6d547b875e8f998619eaad3d3a..d47eea5c26a98ad26991df6ec60ea046565dcb94 100644
--- a/gpu/command_buffer/service/feature_info.cc
+++ b/gpu/command_buffer/service/feature_info.cc
@@ -199,8 +199,7 @@ void FeatureInfo::InitializeBasicState(const base::CommandLine* command_line) {
   feature_flags_.is_swiftshader =
       (command_line->GetSwitchValueASCII(switches::kUseGL) == "swiftshader");
 
-  enable_unsafe_es3_apis_switch_ =
-      command_line->HasSwitch(switches::kEnableUnsafeES3APIs);
+  enable_es3_apis_switch_ = true;
 
   // The shader translator is needed to translate from WebGL-conformant GLES SL
   // to normal GLES SL, enforce WebGL conformance, translate from GLES SL 1.0 to
@@ -210,10 +209,10 @@ void FeatureInfo::InitializeBasicState(const base::CommandLine* command_line) {
   disable_shader_translator_ =
       command_line->HasSwitch(switches::kDisableGLSLTranslator);
 
-  unsafe_es3_apis_enabled_ = false;
+  es3_apis_enabled_ = false;
 
   // Default context_type_ to a GLES2 Context.
-  context_type_ = CONTEXT_TYPE_OPENGLES2;
+  context_type_ = CONTEXT_TYPE_OPENGLES2; // ??
 
   ext_color_buffer_float_available_ = false;
   oes_texture_float_linear_available_ = false;
@@ -1410,7 +1409,10 @@ void FeatureInfo::InitializeFeatures() {
 }
 
 bool FeatureInfo::IsES3Capable() const {
-  if (!enable_unsafe_es3_apis_switch_)
+  if (!enable_es3_apis_switch_)
+    return false;
+  if (context_type_ != CONTEXT_TYPE_WEBGL2 &&
+      context_type_ != CONTEXT_TYPE_OPENGLES3)
     return false;
   if (workarounds_.disable_texture_storage)
     return false;
@@ -1491,7 +1493,7 @@ void FeatureInfo::EnableES3Validators() {
         GL_BGRA8_EXT);
   }
 
-  unsafe_es3_apis_enabled_ = true;
+  es3_apis_enabled_ = true;
 }
 
 bool FeatureInfo::IsWebGLContext() const {