libchrome: Several upstreamable fixes from libchrome

base/memory/shared_memory_posix.cc

Index: base/memory/shared_memory_posix.cc
diff --git a/base/memory/shared_memory_posix.cc b/base/memory/shared_memory_posix.cc
index d55c2df28bd7877ec23b0c42f57c50d8c1aed1e5..d35361f44808696e634adbcb1d7cded5ad14d476 100644
--- a/base/memory/shared_memory_posix.cc
+++ b/base/memory/shared_memory_posix.cc
@@ -286,7 +286,7 @@ bool SharedMemory::Create(const SharedMemoryCreateOptions& options) {
     }
     requested_size_ = options.size;
   }
-  if (fp == NULL) {
+  if (fp == nullptr) {
     PLOG(ERROR) << "Creating shared memory in " << path.value() << " failed";
     FilePath dir = path.DirName();
     if (access(dir.value().c_str(), W_OK | X_OK) < 0) {
@@ -403,7 +403,7 @@ void SharedMemory::Close() {
 bool SharedMemory::PrepareMapFile(ScopedFILE fp, ScopedFD readonly_fd) {
   DCHECK_EQ(-1, mapped_file_);
   DCHECK_EQ(-1, readonly_mapped_file_);
-  if (fp == NULL)
+  if (fp == nullptr)
     return false;
 
   // This function theoretically can block on the disk, but realistically
@@ -462,7 +462,7 @@ bool SharedMemory::FilePathForMemoryName(const std::string& mem_name,
 }
 #endif  // !defined(OS_ANDROID)
 
-bool SharedMemory::ShareToProcessCommon(ProcessHandle process,
+bool SharedMemory::ShareToProcessCommon(ProcessHandle,
                                         SharedMemoryHandle* new_handle,
                                         bool close_self,
                                         ShareMode share_mode) {