More win64 warning fixes.

tools/win_dbghelp.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "windows.h"
 #include "win_dbghelp.h"
 #include <process.h>
@@ skipping 191 matching lines @@
  *  This function expects the .pdb file to be in the same directory.
  */
 void setUpDebuggingFromArgs(const char* vargs0) {
     size_t i = strlen(vargs0);
 
     if (i >= 4 && _stricmp(vargs0 - 4, ".exe") == 0) {
         // Ignore .exe
         i -= 4;
     }
 
-    int pos_period = i;
+    size_t pos_period = i;
 
     // Find last \ in path - this is Windows!
     while (i >= 0 && vargs0[i] != '\\') {
         i--;
     }
 
-    int pos_last_slash = i;
+    size_t pos_last_slash = i;
 
     char app_name[MAX_PATH];
     strncpy(app_name, vargs0 + pos_last_slash + 1, pos_period - pos_last_slash - 1);
     app_name[pos_period - pos_last_slash] = '\0';
     setAppName(app_name);
 
     char binaries_path[MAX_PATH];
     strncpy(binaries_path, vargs0, pos_last_slash);
     binaries_path[pos_last_slash] = '\0';
     setBinariesPath(binaries_path);
 
     setAppVersion("1.0");  // Dummy for now, but use revision instead if we use
                            // the minidump for anything else other than
                            // collecting the callstack.
 
     // cdb.exe is the app used to load the minidump which prints the callstack.
     char cdbExePath[MAX_PATH];
 #ifdef _WIN64
     sprintf(cdbExePath, "%s\\x64\\cdb.exe", SK_CDB_PATH);
 #else
     sprintf(cdbExePath, "%s\\cdb.exe", SK_CDB_PATH);
 #endif
     setCdbPath(cdbExePath);
 }