Revert 69592 - file_version_info was not finding Mac values correctly.

Changed file_version_info to find Mac values, and changed version_info to fail if values can't be found.

BUG=NONE
TEST=BUILD

Review URL: http://codereview.chromium.org/5815001

[email protected]
Review URL: http://codereview.chromium.org/6017003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@69601 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/chrome_frame/metrics_service.cc b/chrome_frame/metrics_service.cc
index 1ca8caa8..d82e16b 100644
--- a/chrome_frame/metrics_service.cc
+++ b/chrome_frame/metrics_service.cc
@@ -608,11 +608,17 @@
 // static
 std::string MetricsService::GetVersionString() {
   chrome::VersionInfo version_info;
-  std::string version = version_info.Version();
-  // Add the -F extensions to ensure that UMA data uploaded by ChromeFrame
-  // lands in the ChromeFrame bucket.
-  version += "-F";
-  if (!version_info.IsOfficialBuild())
-    version.append("-devel");
-  return version;
+  if (version_info.is_valid()) {
+    std::string version = version_info.Version();
+    // Add the -F extensions to ensure that UMA data uploaded by ChromeFrame
+    // lands in the ChromeFrame bucket.
+    version += "-F";
+    if (!version_info.IsOfficialBuild())
+      version.append("-devel");
+    return version;
+  } else {
+    NOTREACHED() << "Unable to retrieve version string.";
+  }
+
+  return std::string();
 }