base: Move SplitString functions into the base namespace and update the callers.

chrome/installer/util/version.cc

Index: chrome/installer/util/version.cc
diff --git a/chrome/installer/util/version.cc b/chrome/installer/util/version.cc
index ab9e4501ecd1a641ee0a2070fabca66bc2680ecf..7618e7dedcab8aac90d25cfbb115916ce44012a6 100644
--- a/chrome/installer/util/version.cc
+++ b/chrome/installer/util/version.cc
@@ -40,7 +40,7 @@ bool installer::Version::IsHigherThan(const installer::Version* other) const {
 installer::Version* installer::Version::GetVersionFromString(
     const string16& version_str) {
   std::vector<string16> numbers;
-  SplitString(version_str, '.', &numbers);
+  base::SplitString(version_str, '.', &numbers);
 
   if (numbers.size() != 4) {
     LOG(ERROR) << "Invalid version string: " << version_str;