Set oem_manifest_loaded_ to true only after the manifest is actually loaded.

Still seeing log spam because we set oem_manifest_loaded_ to true even if the file doesn't exist.

Follow-up to r239700

BUG=314793
TEST=remove oem manifest.json - should not see spam in log file.

Review URL: https://codereview.chromium.org/448403002

Cr-Commit-Position: refs/heads/master@{#288423}
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@288423 0039d316-1c4b-4281-b951-d872f2087c98

chromeos/system/statistics_provider.cc

@@ -267,7 +267,6 @@ void StatisticsProviderImpl::LoadMachineStatistics(bool load_oem_manifest) {
     } else if (base::SysInfo::IsRunningOnChromeOS()) {
       LoadOemManifestFromFile(base::FilePath(kOemManifestFilePath));
     }
-    oem_manifest_loaded_ = true;
   }
 
   if (!base::SysInfo::IsRunningOnChromeOS() &&
@@ -306,6 +305,7 @@ void StatisticsProviderImpl::LoadOemManifestFromFile(
   machine_flags_[kOemKeyboardDrivenOobeKey] =
       oem_manifest.keyboard_driven_oobe;
 
+  oem_manifest_loaded_ = true;
   VLOG(1) << "Loaded OEM Manifest statistics from " << file.value();
 }