Use the desktop GL core profile on Linux when ES3 support is requested.

gpu/command_buffer/service/shader_translator.cc

Index: gpu/command_buffer/service/shader_translator.cc
diff --git a/gpu/command_buffer/service/shader_translator.cc b/gpu/command_buffer/service/shader_translator.cc
index b4a94fc9d7befc12cba4affab7f5fc624199503a..bc8b1fa63eff6f989c7213e82f99ea0a86785e69 100644
--- a/gpu/command_buffer/service/shader_translator.cc
+++ b/gpu/command_buffer/service/shader_translator.cc
@@ -117,19 +117,20 @@ bool ShaderTranslator::Init(
 
   g_translator_initializer.Get();
 
-  ShShaderOutput shader_output;
-  if (glsl_implementation_type == kGlslES) {
-    shader_output = SH_ESSL_OUTPUT;
-  } else {
-    // TODO(kbr): clean up the tests of shader_spec and
-    // gfx::GetGLImplementation(). crbug.com/471960
-    if (shader_spec == SH_WEBGL2_SPEC ||
-        gfx::GetGLImplementation() ==
-            gfx::kGLImplementationDesktopGLCoreProfile) {
-      shader_output = SH_GLSL_CORE_OUTPUT;
-    } else {
+  ShShaderOutput shader_output = SH_ESSL_OUTPUT;
+  switch (glsl_implementation_type) {
+    case kGlsl:
       shader_output = SH_GLSL_COMPATIBILITY_OUTPUT;
-    }
+      break;
+    case kGlslCoreProfile:
+      shader_output = SH_GLSL_CORE_OUTPUT;
+      break;
+    case kGlslES:
+      // Handled in initialization above.
+      break;
+    default:
+      NOTREACHED();
+      break;
   }
 
   {