Revert of Allow storing multiple replacements on SpellCheckResult

components/spellcheck/common/spellcheck_result.h

Index: components/spellcheck/common/spellcheck_result.h
diff --git a/components/spellcheck/common/spellcheck_result.h b/components/spellcheck/common/spellcheck_result.h
index 1937a8f21d843ad3d66ed38eb4a87732ba04e0ef..0c4fb45eff7752edc88a9b2ba0ea7ca20150a9d7 100644
--- a/components/spellcheck/common/spellcheck_result.h
+++ b/components/spellcheck/common/spellcheck_result.h
@@ -6,7 +6,6 @@
 #define COMPONENTS_SPELLCHECK_COMMON_SPELLCHECK_RESULT_H_
 
 #include <stdint.h>
-#include <vector>
 
 #include "base/strings/string16.h"
 
@@ -23,25 +22,16 @@ struct SpellCheckResult {
     GRAMMAR = 1 << 2,
   };
 
-  // Default values are so we have a default constructor for IPC::ReadParam()
-  explicit SpellCheckResult(
-      Decoration d = SPELLING,
-      int loc = 0,
-      int len = 0,
-      const std::vector<base::string16>& rep = std::vector<base::string16>());
-
-  explicit SpellCheckResult(Decoration d,
-                            int loc,
-                            int len,
-                            const base::string16& rep);
-
-  ~SpellCheckResult();
-  SpellCheckResult(const SpellCheckResult&);
+  explicit SpellCheckResult(Decoration d = SPELLING,
+                            int loc = 0,
+                            int len = 0,
+                            const base::string16& rep = base::string16())
+      : decoration(d), location(loc), length(len), replacement(rep) {}
 
   Decoration decoration;
   int location;
   int length;
-  std::vector<base::string16> replacements;
+  base::string16 replacement;
 };
 
 #endif  // COMPONENTS_SPELLCHECK_COMMON_SPELLCHECK_RESULT_H_