clang/win: Fix most -Wunused-function warnings in Chromium code.

chrome/test/base/chrome_process_util.cc

Index: chrome/test/base/chrome_process_util.cc
diff --git a/chrome/test/base/chrome_process_util.cc b/chrome/test/base/chrome_process_util.cc
index 5b9325bec3d753fca11e1f9153d002d923667c23..201b6802e4a64bd19115d5d957b8c2cbe15cc87d 100644
--- a/chrome/test/base/chrome_process_util.cc
+++ b/chrome/test/base/chrome_process_util.cc
@@ -21,6 +21,7 @@ using base::TimeTicks;
 
 namespace {
 
+#if defined(OS_POSIX)
 // Returns the executable name of the current Chrome helper process.
 std::vector<base::FilePath::StringType> GetRunningHelperExecutableNames() {
   base::FilePath::StringType name = chrome::kHelperProcessExecutableName;
@@ -43,6 +44,7 @@ std::vector<base::FilePath::StringType> GetRunningHelperExecutableNames() {
 
   return names;
 }
+#endif  // defined(OS_POSIX)
 
 }  // namespace