Update some Sk4px APIs.

src/opts/Sk4px_SSE2.h

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 namespace { // See Sk4px.h
 
-inline Sk4px::Sk4px(SkPMColor px) : INHERITED(_mm_set1_epi32(px)) {}
+inline Sk4px Sk4px::DupPMColor(SkPMColor px) { return Sk16b(_mm_set1_epi32(px)); }
 
 inline Sk4px Sk4px::Load4(const SkPMColor px[4]) {
     return Sk16b(_mm_loadu_si128((const __m128i*)px));
 }
 inline Sk4px Sk4px::Load2(const SkPMColor px[2]) {
     return Sk16b(_mm_loadl_epi64((const __m128i*)px));
 }
 inline Sk4px Sk4px::Load1(const SkPMColor px[1]) { return Sk16b(_mm_cvtsi32_si128(*px)); }
 
 inline void Sk4px::store4(SkPMColor px[4]) const { _mm_storeu_si128((__m128i*)px, this->fVec); }
@@ skipping 61 matching lines @@
 inline Sk4px Sk4px::zeroColors() const {
     return Sk16b(_mm_and_si128(_mm_set1_epi32(0xFF << SK_A32_SHIFT), this->fVec));
 }
 
 inline Sk4px Sk4px::zeroAlphas() const {
     // andnot(a,b) == ~a & b
     return Sk16b(_mm_andnot_si128(_mm_set1_epi32(0xFF << SK_A32_SHIFT), this->fVec));
 }
 
 }  // namespace