Support 32-bit subversion fields in base::Version.

BUG=464610
TEST=base_unittests

Review URL: https://codereview.chromium.org/985573003

Cr-Commit-Position: refs/heads/master@{#319806}

diff --git a/base/version.h b/base/version.h
index b3012eb9..814acaa 100644
--- a/base/version.h
+++ b/base/version.h

@@ -5,6 +5,7 @@
 #ifndef BASE_VERSION_H_
 #define BASE_VERSION_H_
 
+#include <stdint.h>
 #include <string>
 #include <vector>
 
@@ -57,10 +58,10 @@
   // Return the string representation of this version.
   const std::string GetString() const;
 
-  const std::vector<uint16>& components() const { return components_; }
+  const std::vector<uint32_t>& components() const { return components_; }
 
  private:
-  std::vector<uint16> components_;
+  std::vector<uint32_t> components_;
 };
 
 }  // namespace base