Use UintToString rather than IntToString in version.cc

Version components are unsigned integers, so UintToString() is the
appropriate conversion function to use.

BUG=505479
TEST=base_unittests

Review URL: https://codereview.chromium.org/1208983003

Cr-Commit-Position: refs/heads/master@{#340523}


CrOS-Libchrome-Original-Commit: 0dd50573aeaf8a7c93da361e9049cde7efb7c6a3
diff --git a/base/version.cc b/base/version.cc
index 228dcb8..3677b73 100644
--- a/base/version.cc
+++ b/base/version.cc
@@ -168,10 +168,10 @@
   std::string version_str;
   size_t count = components_.size();
   for (size_t i = 0; i < count - 1; ++i) {
-    version_str.append(IntToString(components_[i]));
+    version_str.append(UintToString(components_[i]));
     version_str.append(".");
   }
-  version_str.append(IntToString(components_[count - 1]));
+  version_str.append(UintToString(components_[count - 1]));
   return version_str;
 }