Refactor language detection logic to allow non-static CLD data sources.

chrome/browser/translate/standalone_cld_data_harness.h

Index: chrome/browser/translate/standalone_cld_data_harness.h
diff --git a/chrome/browser/translate/standalone_cld_data_harness.h b/chrome/browser/translate/standalone_cld_data_harness.h
index a9c37d64f5ff556731caad3df50e9f5a546b50d1..08af5e2c81a48065b34aaed1812762961960910b 100644
--- a/chrome/browser/translate/standalone_cld_data_harness.h
+++ b/chrome/browser/translate/standalone_cld_data_harness.h
@@ -5,15 +5,18 @@
 #ifndef CHROME_BROWSER_TRANSLATE_STANDALONE_CLD_DATA_HARNESS_H_
 #define CHROME_BROWSER_TRANSLATE_STANDALONE_CLD_DATA_HARNESS_H_
 
+#include "base/macros.h"
 #include "chrome/browser/translate/cld_data_harness.h"
 
 namespace test {
 
+// Utility class that sets up a test harness suitable for injecting a standalone
+// CLD data file into the runtime. See CldDataHarness class for more details.
 class StandaloneCldDataHarness : public CldDataHarness {
  public:
-  StandaloneCldDataHarness();
-  virtual ~StandaloneCldDataHarness();
-  virtual void Init() override;
+  StandaloneCldDataHarness() {}
+  ~StandaloneCldDataHarness() override;
+  void Init() override;
 
  private:
   void GetStandaloneDataFileSource(base::FilePath*);