Don't test pipe modes nobody uses.

dm/DM.cpp

 #include "CrashHandler.h"
 #include "DMJsonWriter.h"
 #include "DMSrcSink.h"
 #include "OverwriteLine.h"
 #include "ProcStats.h"
 #include "SkBBHFactory.h"
 #include "SkCommonFlags.h"
 #include "SkForceLinking.h"
 #include "SkGraphics.h"
 #include "SkMD5.h"
@@ skipping 153 matching lines @@
         SINK("565",  RasterSink, kRGB_565_SkColorType);
         SINK("8888", RasterSink, kN32_SkColorType);
         SINK("pdf",  PDFSink);
     }
 #undef SINK
     return NULL;
 }
 
 static Sink* create_via(const char* tag, Sink* wrapped) {
 #define VIA(t, via, ...) if (0 == strcmp(t, tag)) { return new via(__VA_ARGS__); }
+    VIA("pipe",      ViaPipe,          wrapped);
     VIA("serialize", ViaSerialization, wrapped);
-
-    VIA("tiles",    ViaTiles, 256, 256,               NULL, wrapped);
-    VIA("tiles_rt", ViaTiles, 256, 256, new SkRTreeFactory, wrapped);
-
-    const int xp = SkGPipeWriter::kCrossProcess_Flag,
-              sa = xp | SkGPipeWriter::kSharedAddressSpace_Flag;
-    VIA("pipe",    ViaPipe,  0, wrapped);
-    VIA("pipe_xp", ViaPipe, xp, wrapped);
-    VIA("pipe_sa", ViaPipe, sa, wrapped);
+    VIA("tiles",     ViaTiles, 256, 256,               NULL, wrapped);
+    VIA("tiles_rt",  ViaTiles, 256, 256, new SkRTreeFactory, wrapped);
 
     if (FLAGS_matrix.count() == 9) {
         SkMatrix m;
         for (int i = 0; i < 9; i++) {
             m[i] = (SkScalar)atof(FLAGS_matrix[i]);
         }
         VIA("matrix", ViaMatrix, m, wrapped);
     }
 #undef VIA
     return NULL;
@@ skipping 276 matching lines @@
     }
     return 0;
 }
 
 #if !defined(SK_BUILD_FOR_IOS) && !defined(SK_BUILD_FOR_NACL)
 int main(int argc, char** argv) {
     SkCommandLineFlags::Parse(argc, argv);
     return dm_main();
 }
 #endif