Revert 84197 - Add one-time randomization support for FieldTrial, and the ability to

base/rand_util.h

Index: base/rand_util.h
===================================================================
--- base/rand_util.h	(revision 84367)
+++ base/rand_util.h	(working copy)
@@ -29,10 +29,6 @@
 // Returns a random double in range [0, 1). Thread-safe.
 BASE_API double RandDouble();
 
-// Given input |bits|, convert with maximum precision to a double in
-// the range [0, 1). Thread-safe.
-BASE_API double BitsToOpenEndedUnitInterval(uint64 bits);
-
 // Fills |output_length| bytes of |output| with cryptographically strong random
 // data.
 BASE_API void RandBytes(void* output, size_t output_length);