Refactoring: Remove unused argument from GetCPUTypeForProcess

Bug: 742042
Change-Id: I5ff8f3b7be14be1b79bb43ebd349aded5aa818b9
Reviewed-on: https://chromium-review.googlesource.com/575304Reviewed-by: danakj <danakj@chromium.org>
Commit-Queue: Hajime Hoshi <hajimehoshi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#487882}

base/process/process_metrics_mac.cc

@@ -68,7 +68,7 @@ bool GetTaskInfo(mach_port_t task, task_basic_info_64* task_info_data) {
   return kr == KERN_SUCCESS;
 }
 
-bool GetCPUTypeForProcess(pid_t pid, cpu_type_t* cpu_type) {
+bool GetCPUType(cpu_type_t* cpu_type) {
   size_t len = sizeof(*cpu_type);
   int result = sysctlbyname("sysctl.proc_cputype",
                             cpu_type,
@@ -165,7 +165,7 @@ bool ProcessMetrics::GetMemoryBytes(size_t* private_bytes,
   }
 
   cpu_type_t cpu_type;
-  if (!GetCPUTypeForProcess(process_, &cpu_type))
+  if (!GetCPUType(&cpu_type))
     return false;
 
   // The same region can be referenced multiple times. To avoid double counting