Remove ShaderTranslatorTest.BuiltInFunctionEmulation

This test becomes invalid with the upcoming angle changes. This test
expects webgle_dot_emu to be always there in translated shader source
but with the constant folding implemented in ANGLE for built-in
'dot', 'dot' function call will be replaced by actual result when all
the arguments are constant expressions and webgl_dot_emu will no
longer be there in translated shader source.

R=zmo

Review URL: https://codereview.chromium.org/1161463013

Cr-Commit-Position: refs/heads/master@{#333093}

gpu/command_buffer/service/shader_translator_unittest.cc

@@ -282,39 +282,6 @@ TEST_F(ShaderTranslatorTest, GetUniforms) {
   EXPECT_STREQ("bar[1].foo.color[0]", original_name.c_str());
 }
 
-#if defined(OS_MACOSX)
-TEST_F(ShaderTranslatorTest, BuiltInFunctionEmulation) {
-  // This test might become invalid in the future when ANGLE Translator is no
-  // longer emulate dot(float, float) in Mac, or the emulated function name is
-  // no longer webgl_dot_emu.
-  const char* shader =
-      "void main() {\n"
-      "  gl_Position = vec4(dot(1.0, 1.0), 1.0, 1.0, 1.0);\n"
-      "}";
-
-  std::string info_log, translated_source;
-  int shader_version;
-  AttributeMap attrib_map;
-  UniformMap uniform_map;
-  VaryingMap varying_map;
-  NameMap name_map;
-  EXPECT_TRUE(vertex_translator_->Translate(shader,
-                                            &info_log,
-                                            &translated_source,
-                                            &shader_version,
-                                            &attrib_map,
-                                            &uniform_map,
-                                            &varying_map,
-                                            &name_map));
-  // Info log must be NULL.
-  EXPECT_TRUE(info_log.empty());
-  // Translated shader must be valid and non-empty.
-  ASSERT_FALSE(translated_source.empty());
-  EXPECT_TRUE(strstr(translated_source.c_str(),
-                     "webgl_dot_emu") != NULL);
-}
-#endif
-
 TEST_F(ShaderTranslatorTest, OptionsString) {
   scoped_refptr<ShaderTranslator> translator_1 = new ShaderTranslator();
   scoped_refptr<ShaderTranslator> translator_2 = new ShaderTranslator();