Remove unneeded includes of base/string_piece.h

chrome/common/jstemplate_builder.h

Index: chrome/common/jstemplate_builder.h
===================================================================
--- chrome/common/jstemplate_builder.h	(revision 13095)
+++ chrome/common/jstemplate_builder.h	(working copy)
@@ -10,14 +10,15 @@
 // - given a json data object, run the jstemplate javascript which fills in
 //   template values
 
-#ifndef CHROME_RENDERER_JSTEMPLATE_BUILDER_H__
-#define CHROME_RENDERER_JSTEMPLATE_BUILDER_H__
+#ifndef CHROME_COMMON_JSTEMPLATE_BUILDER_H_
+#define CHROME_COMMON_JSTEMPLATE_BUILDER_H_
 
 #include <string>
 
 #include "base/values.h"
-#include "base/string_piece.h"
 
+class StringPiece;
+
 namespace jstemplate_builder {
   // A helper function that generates a string of HTML to be loaded.  The
   // string includes the HTML and the javascript code necessary to generate the
@@ -26,4 +27,4 @@
                               const DictionaryValue* json,
                               const StringPiece& template_id);
 }  // namespace jstemplate_builder
-#endif // CHROME_RENDERER_JSTEMPLATE_BUILDER_H__
+#endif  // CHROME_COMMON_JSTEMPLATE_BUILDER_H_