Include implicit_cast.h at all users of it.

util/posix/process_info_test.cc

 // Copyright 2014 The Crashpad Authors. All rights reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
 //     http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
 #include "util/posix/process_info.h"
 
 #include <time.h>
 #include <unistd.h>
 
 #include <set>
 #include <string>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "build/build_config.h"
 #include "gtest/gtest.h"
 #include "test/errors.h"
+#include "util/misc/implicit_cast.h"
 
 #if defined(OS_MACOSX)
 #include <crt_externs.h>
 #endif
 
 namespace crashpad {
 namespace test {
 namespace {
 
 void TestSelfProcess(const ProcessInfo& process_info) {
@@ skipping 101 matching lines @@
   EXPECT_EQ(implicit_cast<uid_t>(0), process_info.SavedUserID());
   EXPECT_EQ(implicit_cast<gid_t>(0), process_info.RealGroupID());
   EXPECT_EQ(implicit_cast<gid_t>(0), process_info.EffectiveGroupID());
   EXPECT_EQ(implicit_cast<gid_t>(0), process_info.SavedGroupID());
   EXPECT_FALSE(process_info.AllGroups().empty());
 }
 
 }  // namespace
 }  // namespace test
 }  // namespace crashpad