diff --git a/source/data/Makefile.in b/source/data/Makefile.in
index b1b3b36..88e3c35 100644
--- a/source/data/Makefile.in
+++ b/source/data/Makefile.in
@@ -246,7 +246,8 @@ package390: $(OUTTMPDIR)/icudata390.lst $(PKGDATA_LIST) ./icupkg.inc packagedata
 #  2010-dec Removed pnames.icu.
 # These are now hardcoded in ICU4C and only loaded in ICU4J.
 #
-DAT_FILES_SHORT=unames.icu cnvalias.icu coll/ucadata.icu nfkc.nrm nfkc_cf.nrm uts46.nrm
+# Chromium: Drop unames.icu because we don't need Unicode character names.
+DAT_FILES_SHORT=cnvalias.icu coll/ucadata.icu nfkc.nrm nfkc_cf.nrm uts46.nrm
 DAT_FILES=$(DAT_FILES_SHORT:%=$(BUILDDIR)/%)
 
 ## BRK files
@@ -277,7 +278,8 @@ CFU_FILES=$(BUILDDIR)/$(CFU_FILES_SHORT)
 -include $(UCMSRCDIR)/ucmfiles.mk
 -include $(UCMSRCDIR)/ucmebcdic.mk
 -include $(UCMSRCDIR)/ucmlocal.mk
-ALL_UCM_SOURCE=ibm-37_P100-1995.ucm ibm-1047_P100-1995.ucm $(UCM_SOURCE_CORE) $(UCM_SOURCE_FILES) $(UCM_SOURCE_EBCDIC) $(UCM_SOURCE_LOCAL)
+# Chromium: Drop 2 ibm encodings not necessary.
+ALL_UCM_SOURCE=$(UCM_SOURCE_CORE) $(UCM_SOURCE_FILES) $(UCM_SOURCE_EBCDIC) $(UCM_SOURCE_LOCAL)
 UCM_FILES = $(ALL_UCM_SOURCE:%=$(SRCDATADIR)/%)
 CNV_FILES = $(ALL_UCM_SOURCE:%.ucm=$(BUILDDIR)/%.cnv)
 CNV_FILES_SHORT = $(ALL_UCM_SOURCE:%.ucm=%.cnv)
@@ -351,7 +353,9 @@ TRANSLIT_SRC= $(TRANSLIT_SOURCE) $(TRANSLIT_ALIAS_SOURCE) $(TRANSLIT_SOURCE_LOCA
 TRANSLIT_SRC_FILES = $(TRANSLIT_SRC:%=$(TRANSLITSRCDIR)/%)
 INSTALLED_TRANSLIT_FILES = $(TRANSLIT_SOURCE:%.txt=%)  $(TRANSLIT_SOURCE_LOCAL:%.txt=%)
 endif
-GENRBOPTS=-k
+# Chromium : To save space, use '-R' option (exclude collation rules. just
+# include the compiled binary data.)
+GENRBOPTS=-k -R
 
 ## MISC files
 -include $(MISCSRCDIR)/miscfiles.mk
@@ -529,7 +533,14 @@ $(BUILDDIR)/%.icu: $(SRCDATADIR)/in/%.icu
 $(BUILDDIR)/%.nrm: $(SRCDATADIR)/in/%.nrm
 	$(INVOKE) $(TOOLBINDIR)/icupkg -t$(ICUDATA_CHAR) $< $@
 
-$(BUILDDIR)/coll/ucadata.icu: $(SRCDATADIR)/in/coll/ucadata-unihan.icu
+# Chromium: To cut down the data size by 280kB,
+# use the code point order for CJK Ideographs in non-CJK locales instead
+# of the UniHan radical-stroke order. The latter is better, but non-CJK
+# locales do not have a great need for sorting CJK Ideographs.
+# Moreover, the most common subset (the original CJK Ideograph block) will
+# still be sorted correctly because the code point order is radical-stroke
+# order.
+$(BUILDDIR)/coll/ucadata.icu: $(SRCDATADIR)/in/coll/ucadata-implicithan.icu
 	$(INVOKE) $(TOOLBINDIR)/icupkg -t$(ICUDATA_CHAR) $< $@
 
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