-Wuninitialized fixes

base/process_util_posix.cc

 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <dirent.h>
 #include <errno.h>
 #include <fcntl.h>
 #include <signal.h>
 #include <stdlib.h>
 #include <sys/resource.h>
@@ skipping 357 matching lines @@
   // First assume that all of the current environment will be included.
   for (unsigned i = 0; env[i]; i++) {
     const char *const pair = env[i];
     count++;
     size += strlen(pair) + 1 /* terminating NUL */;
   }
 
   for (environment_vector::const_iterator
        j = changes.begin(); j != changes.end(); j++) {
     bool found = false;
-    const char *pair;
+    const char *pair = NULL;  // clang pr9062
 
     for (unsigned i = 0; env[i]; i++) {
       pair = env[i];
       const char *const equals = strchr(pair, '=');
       if (!equals)
         continue;
       const unsigned keylen = equals - pair;
       if (keylen == j->first.size() &&
           memcmp(pair, j->first.data(), keylen) == 0) {
         found = true;
@@ skipping 516 matching lines @@
                       const ProcessFilter* filter) {
   bool exited_cleanly =
       WaitForProcessesToExit(executable_name, wait_milliseconds,
                              filter);
   if (!exited_cleanly)
     KillProcesses(executable_name, exit_code, filter);
   return exited_cleanly;
 }
 
 }  // namespace base