Remove support for inheriting the paint color from SkColorShader

tests/ShaderOpacityTest.cpp

Index: tests/ShaderOpacityTest.cpp
diff --git a/tests/ShaderOpacityTest.cpp b/tests/ShaderOpacityTest.cpp
index e55560365a8c7e00c58b780cd9db4b6c9e222e26..506c7cd36ac42592e9ff9c625bf12c32a3505c65 100644
--- a/tests/ShaderOpacityTest.cpp
+++ b/tests/ShaderOpacityTest.cpp
@@ -103,11 +103,6 @@ static void test_color(skiatest::Reporter* reporter)
     REPORTER_ASSERT(reporter, colorShader2.isOpaque());
     SkColorShader colorShader3(SkColorSetARGB(0x7F,0,0,0));
     REPORTER_ASSERT(reporter, !colorShader3.isOpaque());
-
-    // with inherrited color, shader must declare itself as opaque,
-    // since lack of opacity will depend solely on the paint
-    SkColorShader colorShader4;
-    REPORTER_ASSERT(reporter, colorShader4.isOpaque());
 }
 
 DEF_TEST(ShaderOpacity, reporter) {