Add empty implementation of GetSystemMemoryInfo for IOS.

base/process/process_metrics_unittest.cc

 // Copyright 2013 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 "base/process/process_metrics.h"
 
 #include <sstream>
 #include <string>
 
 #include "base/threading/thread.h"
@@ skipping 289 matching lines @@
 #endif  // defined(OS_LINUX) || defined(OS_ANDROID)
 
 #if defined(OS_CHROMEOS)
   // Chrome OS exposes shmem.
   EXPECT_GT(info.shmem, 0);
   EXPECT_LT(info.shmem, info.total);
   // Chrome unit tests are not run on actual Chrome OS hardware, so gem_objects
   // and gem_size cannot be tested here.
 #endif
 }
-#endif  // defined(OS_WIN) || (defined(OS_MACOSX)  && !defined(OS_IOS)) ||
+#endif  // defined(OS_WIN) || (defined(OS_MACOSX) && !defined(OS_IOS)) ||
         // defined(OS_LINUX) || defined(OS_ANDROID)
 
 #if defined(OS_LINUX) || defined(OS_ANDROID)
 TEST(ProcessMetricsTest, ParseProcStatCPU) {
   // /proc/self/stat for a process running "top".
   const char kTopStat[] = "960 (top) S 16230 960 16230 34818 960 "
       "4202496 471 0 0 0 "
       "12 16 0 0 "  // <- These are the goods.
       "20 0 1 0 121946157 15077376 314 18446744073709551615 4194304 "
       "4246868 140733983044336 18446744073709551615 140244213071219 "
@@ skipping 39 matching lines @@
       ASSERT_EQ(base::GetNumberOfThreads(current), initial_threads + 1 + i);
     }
   }
   // The Thread destructor will stop them.
   ASSERT_EQ(initial_threads, base::GetNumberOfThreads(current));
 }
 #endif  // defined(OS_LINUX)
 
 }  // namespace debug
 }  // namespace base