Remove image decoder and encoder autoregistration

dm/DM.cpp

 // Main binary for DM.
 // For a high-level overview, please see dm/README.
 
 #include "CrashHandler.h"
 #include "LazyDecodeBitmap.h"
 #include "SkCommonFlags.h"
-#include "SkForceLinking.h"
 #include "SkGraphics.h"
 #include "SkOSFile.h"
 #include "SkPicture.h"
 #include "SkString.h"
 #include "SkTaskGroup.h"
 #include "Test.h"
 #include "gm.h"
 #include "sk_tool_utils.h"
 #include "sk_tool_utils_flags.h"
 
@@ skipping 23 matching lines @@
 using skiatest::TestRegistry;
 
 static const char kGpuAPINameGL[] = "gl";
 static const char kGpuAPINameGLES[] = "gles";
 
 DEFINE_bool(gms, true, "Run GMs?");
 DEFINE_bool(tests, true, "Run tests?");
 DEFINE_bool(reportUsedChars, false, "Output test font construction data to be pasted into"
                                     " create_test_font.cpp.");
 
-__SK_FORCE_IMAGE_DECODER_LINKING;
-
 // "FooBar" -> "foobar".  Obviously, ASCII only.
 static SkString lowercase(SkString s) {
     for (size_t i = 0; i < s.size(); i++) {
         s[i] = tolower(s[i]);
     }
     return s;
 }
 
 static const GrContextFactory::GLContextType native = GrContextFactory::kNative_GLContextType;
 static const GrContextFactory::GLContextType nvpr   = GrContextFactory::kNVPR_GLContextType;
@@ skipping 177 matching lines @@
     report_failures(failures);
     return failures.count() > 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