[platform] Remove dead {OS::StrChr} wrapper.

Change-Id: Ifbf1b49d7caad9b050945b07065ee5ecb9d9f9e4
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1588470Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Commit-Queue: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#61119}

src/base/platform/platform-posix.cc

@@ -678,11 +678,6 @@ int OS::VSNPrintF(char* str,
 // POSIX string support.
 //
 
-char* OS::StrChr(char* str, int c) {
-  return strchr(str, c);
-}
-
-
 void OS::StrNCpy(char* dest, int length, const char* src, size_t n) {
   strncpy(dest, src, n);
 }

src/base/platform/platform-win32.cc

@@ -670,11 +670,6 @@ int OS::VSNPrintF(char* str, int length, const char* format, va_list args) {
 }
 
 
-char* OS::StrChr(char* str, int c) {
-  return const_cast<char*>(strchr(str, c));
-}
-
-
 void OS::StrNCpy(char* dest, int length, const char* src, size_t n) {
   // Use _TRUNCATE or strncpy_s crashes (by design) if buffer is too small.
   size_t buffer_size = static_cast<size_t>(length);

src/base/platform/platform.h

@@ -207,7 +207,6 @@ class V8_BASE_EXPORT OS {
   static PRINTF_FORMAT(3, 0) int VSNPrintF(char* str, int length,
                                            const char* format, va_list args);
 
-  static char* StrChr(char* str, int c);
   static void StrNCpy(char* dest, int length, const char* src, size_t n);
 
   // Support for the profiler.  Can do nothing, in which case ticks