Drop support for Compact Language Detector v1.

components/translate/core/language_detection/language_detection_util.cc

Index: components/translate/core/language_detection/language_detection_util.cc
diff --git a/components/translate/core/language_detection/language_detection_util.cc b/components/translate/core/language_detection/language_detection_util.cc
index ddd8a9f91667f8760adb6db565ea859bce63472d..7d34c913240263c6e34c68544d577acfdc4a2918 100644
--- a/components/translate/core/language_detection/language_detection_util.cc
+++ b/components/translate/core/language_detection/language_detection_util.cc
@@ -16,16 +16,8 @@
 #include "components/translate/core/common/translate_constants.h"
 #include "components/translate/core/common/translate_metrics.h"
 #include "components/translate/core/common/translate_util.h"
-
-#if CLD_VERSION==1
-#include "third_party/cld/encodings/compact_lang_det/compact_lang_det.h"
-#include "third_party/cld/encodings/compact_lang_det/win/cld_unicodetext.h"
-#endif
-
-#if CLD_VERSION==2
 #include "third_party/cld_2/src/public/compact_lang_det.h"
 #include "third_party/cld_2/src/public/encodings.h"
-#endif
 
 namespace {
 
@@ -90,15 +82,6 @@ std::string DetermineTextLanguage(const base::string16& text,
   int cld_language = 0;
   bool is_valid_language = false;
 
-#if CLD_VERSION==1
-  int num_languages = 0;
-  cld_language = DetectLanguageOfUnicodeText(NULL, text.c_str(), is_plain_text,
-                                             &is_reliable, &num_languages, NULL,
-                                             &num_bytes_evaluated);
-  is_valid_language = cld_language != NUM_LANGUAGES &&
-                      cld_language != UNKNOWN_LANGUAGE &&
-                      cld_language != TG_UNKNOWN_LANGUAGE;
-#elif CLD_VERSION==2
   const std::string utf8_text(base::UTF16ToUTF8(text));
   const int num_utf8_bytes = static_cast<int>(utf8_text.size());
   const char* raw_utf8_bytes = utf8_text.c_str();
@@ -142,11 +125,6 @@ std::string DetermineTextLanguage(const base::string16& text,
   if (is_valid_language)
     UMA_HISTOGRAM_PERCENTAGE("Translate.CLD2.LanguageAccuracy", percent3[0]);
 
-
-#else
-# error "CLD_VERSION must be 1 or 2"
-#endif
-
   if (is_cld_reliable != NULL)
     *is_cld_reliable = is_reliable;
 
@@ -163,9 +141,7 @@ std::string DetermineTextLanguage(const base::string16& text,
     // |LanguageCodeWithDialect| will go through ISO 639-1, ISO-639-2 and
     // 'other' tables to do the 'right' thing. In addition, it'll return zh-CN
     // for Simplified Chinese.
-#if CLD_VERSION==1
-    language = LanguageCodeWithDialects(static_cast<Language>(cld_language));
-#elif CLD_VERSION==2
+    //
     // (1) CLD2's LanguageCode returns general Chinese 'zh' for
     // CLD2::CHINESE, but Translate server doesn't accept it. This is
     // converted to 'zh-CN' in the same way as CLD1's
@@ -181,9 +157,6 @@ std::string DetermineTextLanguage(const base::string16& text,
       language = "zh-TW";
     else
       language = CLD2::LanguageCode(static_cast<CLD2::Language>(cld_language));
-#else
-# error "CLD_VERSION must be 1 or 2"
-#endif
   }
   VLOG(9) << "Detected lang_id: " << language << ", from Text:\n" << text
           << "\n*************************************\n";