Revert "Moving StringPrintf to libbase."

libbase has been reverted

This reverts commit 7ed5fa1e4d37722a644518594bf2b0e1529c05e9.

Change-Id: I5d8ff8c38ff8c9123e6cee5dc15a101a79e94b2e
diff --git a/benchmarks/Android.mk b/benchmarks/Android.mk
index e1580fe..ae0541f 100644
--- a/benchmarks/Android.mk
+++ b/benchmarks/Android.mk
@@ -42,7 +42,7 @@
 LOCAL_CPPFLAGS := $(benchmark_cppflags)
 LOCAL_SRC_FILES := $(benchmarklib_src_files)
 LOCAL_C_INCLUDES := $(benchmark_c_includes)
-LOCAL_STATIC_LIBRARIES := libbase
+LOCAL_STATIC_LIBRARIES := libutils
 include $(BUILD_STATIC_LIBRARY)
 
 # Only supported on linux systems.
@@ -55,7 +55,7 @@
 LOCAL_SRC_FILES := $(benchmarklib_src_files)
 LOCAL_C_INCLUDES := $(benchmark_c_includes)
 LOCAL_MULTILIB := both
-LOCAL_STATIC_LIBRARIES := libbase
+LOCAL_STATIC_LIBRARIES := libutils
 include $(BUILD_HOST_STATIC_LIBRARY)
 
 endif
@@ -84,7 +84,7 @@
 LOCAL_CFLAGS := $(benchmark_cflags)
 LOCAL_CPPFLAGS := $(benchmark_cppflags)
 LOCAL_SRC_FILES := $(benchmark_src_files)
-LOCAL_STATIC_LIBRARIES := libbenchmark libbase
+LOCAL_STATIC_LIBRARIES := libbenchmark libutils
 include $(BUILD_EXECUTABLE)
 
 # We don't build a static benchmark executable because it's not usually
@@ -106,7 +106,7 @@
 LOCAL_CPPFLAGS := $(benchmark_cppflags)
 LOCAL_LDFLAGS := -lrt
 LOCAL_SRC_FILES := $(benchmark_src_files)
-LOCAL_STATIC_LIBRARIES := libbenchmark libbase
+LOCAL_STATIC_LIBRARIES := libbenchmark libutils
 include $(BUILD_HOST_EXECUTABLE)
 
 endif