Move files in wtf/ to platform/wtf/ (Part 4).

third_party/WebKit/Source/platform/wtf/StringExtras.h

Index: third_party/WebKit/Source/platform/wtf/StringExtras.h
diff --git a/third_party/WebKit/Source/wtf/StringExtras.h b/third_party/WebKit/Source/platform/wtf/StringExtras.h
similarity index 97%
copy from third_party/WebKit/Source/wtf/StringExtras.h
copy to third_party/WebKit/Source/platform/wtf/StringExtras.h
index 6544f6ecf4d35f663b12d2fddf5ea99b0791e013..aafdeb09fe737ad0e8773e670ed088acd9427bb4 100644
--- a/third_party/WebKit/Source/wtf/StringExtras.h
+++ b/third_party/WebKit/Source/platform/wtf/StringExtras.h
@@ -26,7 +26,7 @@
 #ifndef WTF_StringExtras_h
 #define WTF_StringExtras_h
 
-#include "wtf/build_config.h"
+#include "platform/wtf/build_config.h"
 #include <stdarg.h>
 #include <stdio.h>
 #include <string.h>
@@ -55,7 +55,7 @@ inline int snprintf(char* buffer, size_t count, const char* format, ...) {
   return result;
 }
 
-inline double wtf_vsnprintf(char* buffer,
+inline double wtf_vsnprintf(char* buffer,  // NOLINT
                             size_t count,
                             const char* format,
                             va_list args) {