Revert "Updating the mapped_file_avoid_mmap_posix implementation."

net/disk_cache/disk_cache_test_util.cc

Index: net/disk_cache/disk_cache_test_util.cc
diff --git a/net/disk_cache/disk_cache_test_util.cc b/net/disk_cache/disk_cache_test_util.cc
index 12eea8578b7857d1fcdee4218a016c55b328e6c9..8f334f053703b3a5c4f74b174f15992d577c01d2 100644
--- a/net/disk_cache/disk_cache_test_util.cc
+++ b/net/disk_cache/disk_cache_test_util.cc
@@ -42,10 +42,6 @@ void CacheTestFillBuffer(char* buffer, size_t len, bool no_nulls) {
 }
 
 bool CreateCacheTestFile(const base::FilePath& name) {
-  return CreateCacheTestFileWithSize(name, 4 * 1024 * 1024);
-}
-
-bool CreateCacheTestFileWithSize(const base::FilePath& name, size_t size){
   int flags = base::PLATFORM_FILE_CREATE_ALWAYS |
               base::PLATFORM_FILE_READ |
               base::PLATFORM_FILE_WRITE;
@@ -55,7 +51,7 @@ bool CreateCacheTestFileWithSize(const base::FilePath& name, size_t size){
   if (!file->IsValid())
     return false;
 
-  file->SetLength(size);
+  file->SetLength(4 * 1024 * 1024);
   return true;
 }