Rename helper function WriteFile to give it a unique name

In //extensions/browser a second helper function named
WriteFile just appeared and in jumbo builds where all of
extensions/browser is compiled in one translation unit (an extreme
jumbo configuration), the two clash. This patch renames the function
that is the least like base::WriteFile to "CreateDirAndWriteFile".

Change-Id: I0d3dc1bb3e13279a2bf333bc0c12985f2133a35d
Reviewed-on: https://chromium-review.googlesource.com/980056
Commit-Queue: Daniel Bratell <bratell@opera.com>
Reviewed-by: Istiaque Ahmed <lazyboy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#546050}

extensions/browser/content_verifier/content_hash.cc

@@ -28,7 +28,8 @@ namespace {
 
 using SortedFilePathSet = std::set<base::FilePath>;
 
-bool WriteFile(const base::FilePath& destination, const std::string& content) {
+bool CreateDirAndWriteFile(const base::FilePath& destination,
+                           const std::string& content) {
   base::AssertBlockingAllowed();
   DCHECK(GetExtensionFileTaskRunner()->RunsTasksInCurrentSequence());
   base::FilePath dir = destination.DirName();
@@ -196,7 +197,7 @@ void ContentHash::DidFetchVerifiedContents(
 
   base::FilePath destination =
       file_util::GetVerifiedContentsPath(key.extension_root);
-  if (!WriteFile(destination, *fetched_contents)) {
+  if (!CreateDirAndWriteFile(destination, *fetched_contents)) {
     LOG(ERROR) << "Error writing computed_hashes.json at " << destination;
     ContentHash::DispatchFetchFailure(key, std::move(created_callback),
                                       is_cancelled);