supersize: Don't cluster by default. Make Diff() accept only SizeInfo.

tools/binary_size/libsupersize/testdata/Archive_OutputDirectory.golden

Index: tools/binary_size/libsupersize/testdata/Archive_OutputDirectory.golden
diff --git a/tools/binary_size/libsupersize/testdata/Archive_OutputDirectory.golden b/tools/binary_size/libsupersize/testdata/Archive_OutputDirectory.golden
index 6de62140411ba0a6f34d4429b845e9c103ce7278..beca925f9d052f2ba0082e8fc4b6b63590f6adff 100644
--- a/tools/binary_size/libsupersize/testdata/Archive_OutputDirectory.golden
+++ b/tools/binary_size/libsupersize/testdata/Archive_OutputDirectory.golden
@@ -37,10 +37,11 @@ Section t: has 0.2% of 79710 bytes accounted for from 14 symbols. 35821002 bytes
 .data.rel.ro.local@2c17740(size_without_padding=789904,padding=0,name=chrome::mojom::FieldTrialRecorderProxy [vtable],object_path=third_party/WebKit.a/ContiguousContainer.o,source_path=third_party/container.c,flags={})
 .data.rel.ro.local@2cd84e0(size_without_padding=16,padding=16,name=.Lswitch.table.45,object_path=third_party/gvr-android-sdk/libgvr_shim_static_arm.a/libcontroller_api_impl.a_controller_api_impl.o,source_path=,flags={})
 .data.rel.ro.local@2cd84f0(size_without_padding=8,padding=0,name=kSystemClassPrefixes,object_path=third_party/gvr-android-sdk/libgvr_shim_static_arm.a/libport_android_jni.a_jni_utils.o,source_path=,flags={anon})
-Group(name=** merge strings,count=2,size=2641394)
+.rodata@266e600(size_without_padding=1965409,padding=0,name=** merge strings,object_path=,source_path=,flags={})
 .rodata@284e364(size_without_padding=8,padding=3,name=,object_path=base/base/page_allocator.o,source_path=base/page_allocator.cc,flags={})
 .rodata@284e370(size_without_padding=40,padding=4,name=Name,object_path=base/base/page_allocator.o,source_path=base/page_allocator.cc,flags={})
 .rodata@284e398(size_without_padding=32,padding=0,name=chrome::mojom::FilePatcher::Name_,object_path=third_party/WebKit.a/ContiguousContainer.o,source_path=third_party/container.c,flags={})
+.rodata@284e518(size_without_padding=675633,padding=352,name=** merge strings,object_path=,source_path=,flags={})
 .rodata@28f3450(size_without_padding=48,padding=7,name=kAnimationFrameTimeHistogramClassPath,object_path=third_party/WebKit.a/PaintChunker.o,source_path=third_party/paint.cc,flags={anon})
 .rodata@28f3480(size_without_padding=4,padding=0,name=blink::CSSValueKeywordsHash::findValueImpl::value_word_list,object_path=third_party/WebKit.a/PaintChunker.o,source_path=third_party/paint.cc,flags={anon})
 .text@28d900(size_without_padding=16,padding=0,name=_GLOBAL__sub_I_page_allocator.cc,object_path=base/base/page_allocator.o,source_path=base/page_allocator.cc,flags={startup})
@@ -48,11 +49,12 @@ Group(name=** merge strings,count=2,size=2641394)
 .text@28d948(size_without_padding=28,padding=0,name=_GLOBAL__sub_I_pacing_sender.cc,object_path=base/base/page_allocator.o,source_path=base/page_allocator.cc,flags={startup})
 .text@28d964(size_without_padding=38,padding=0,name=extFromUUseMapping,object_path=base/base/page_allocator.o,source_path=base/page_allocator.cc,flags={})
 .text@28d98a(size_without_padding=32,padding=0,name=extFromUUseMapping,object_path=base/base/page_allocator.o,source_path=base/page_allocator.cc,flags={})
-Group(name=** symbol gaps,count=2,size=9758)
+.text@28f000(size_without_padding=0,padding=5718,name=** symbol gap 0,object_path=third_party/icu/icuuc/ucnv_ext.o,source_path=third_party/icu/ucnv_ext.c,flags={})
 .text@28f000(size_without_padding=448,padding=0,name=ucnv_extMatchFromU,object_path=third_party/icu/icuuc/ucnv_ext.o,source_path=third_party/icu/ucnv_ext.c,flags={})
 .text@28f1c8(size_without_padding=20,padding=8,name=_GLOBAL__sub_I_SkDeviceProfile.cpp,object_path=third_party/icu/icuuc/ucnv_ext.o,source_path=third_party/icu/ucnv_ext.c,flags={startup})
 .text@28f1e0(size_without_padding=69120,padding=4,name=foo_bar,object_path=third_party/icu/icuuc/ucnv_ext.o,source_path=third_party/icu/ucnv_ext.c,flags={unlikely})
 .text@2a0000(size_without_padding=16,padding=32,name=blink::ContiguousContainerBase::shrinkToFit,object_path=third_party/WebKit.a/PaintChunker.o,source_path=third_party/paint.cc,flags={})
 .text@2a0010(size_without_padding=12,padding=0,name=blink::ContiguousContainerBase::shrinkToFit [clone .part.1234] [clone .isra.2],object_path=third_party/WebKit.a/PaintChunker.o,source_path=third_party/paint.cc,flags={})
 .text@2a0020(size_without_padding=24,padding=4,name=blink::ContiguousContainerBase::ContiguousContainerBase,object_path=third_party/WebKit.a/ContiguousContainer.o,source_path=third_party/container.c,flags={})
+.text@2a1000(size_without_padding=0,padding=4040,name=** symbol gap 1,object_path=third_party/WebKit.a/ContiguousContainer.o,source_path=third_party/container.c,flags={})
 .text@2a1000(size_without_padding=94,padding=0,name=blink::PaintChunker::releasePaintChunks [clone .part.1],object_path=third_party/WebKit.a/ContiguousContainer.o,source_path=third_party/container.c,flags={anon})