SkPDF: clean up overuse of SK_SUPPORT_PDF

tests/skpdf_opaquesrcmodetosrcover.cpp

-/*
- * Copyright 2015 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-#include "SkCanvas.h"
-#include "SkDocument.h"
-#include "SkStream.h"
-#include "Test.h"
-
-#if SK_SUPPORT_PDF
-
-static void run_test(SkWStream* out, SkXfermode::Mode mode, U8CPU alpha) {
-    SkAutoTUnref<SkDocument> pdfDoc(SkDocument::CreatePDF(out));
-    SkCanvas* c = pdfDoc->beginPage(612.0f, 792.0f);
-    SkPaint black;
-    SkPaint background;
-    background.setColor(SK_ColorWHITE);
-    background.setAlpha(alpha);
-    background.setXfermodeMode(mode);
-    c->drawRect(SkRect::MakeWH(612.0f, 792.0f), background);
-    c->drawRect(SkRect::MakeXYWH(36.0f, 36.0f, 9.0f, 9.0f), black);
-    c->drawRect(SkRect::MakeXYWH(72.0f, 72.0f, 468.0f, 648.0f), background);
-    c->drawRect(SkRect::MakeXYWH(108.0f, 108.0f, 9.0f, 9.0f), black);
-    pdfDoc->close();
-}
-
-// http://crbug.com/473572
-DEF_TEST(SkPDF_OpaqueSrcModeToSrcOver, r) {
-    SkDynamicMemoryWStream srcMode;
-    SkDynamicMemoryWStream srcOverMode;
-
-    U8CPU alpha = SK_AlphaOPAQUE;
-    run_test(&srcMode, SkXfermode::kSrc_Mode, alpha);
-    run_test(&srcOverMode, SkXfermode::kSrcOver_Mode, alpha);
-    REPORTER_ASSERT(r, srcMode.getOffset() == srcOverMode.getOffset());
-    // The two PDFs should be equal because they have an opaque alpha.
-
-    srcMode.reset();
-    srcOverMode.reset();
-
-    alpha = 0x80;
-    run_test(&srcMode, SkXfermode::kSrc_Mode, alpha);
-    run_test(&srcOverMode, SkXfermode::kSrcOver_Mode, alpha);
-    REPORTER_ASSERT(r, srcMode.getOffset() > srcOverMode.getOffset());
-    // The two PDFs should not be equal because they have a non-opaque alpha.
-}
-#endif  // SK_SUPPORT_PDF