Fix issue where it fails when writing to pref files

The intermediate "ChromeWebView" folder was never created, so writes to
files in that folder just fails.

Change-Id: I2d0880fd9ce600fab08f4e23ed116febdaf76b95
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1825735
Commit-Queue: John Wu <jzw@chromium.org>
Reviewed-by: Hiroshi Ichikawa <ichikawa@chromium.org>
Cr-Commit-Position: refs/heads/master@{#700075}

ios/web_view/internal/app/application_context.mm

@@ -109,9 +109,7 @@ PrefService* ApplicationContext::GetLocalState() {
     base::FilePath local_state_path;
     base::PathService::Get(base::DIR_APP_DATA, &local_state_path);
     local_state_path =
-        local_state_path.Append(FILE_PATH_LITERAL("ChromeWebView"));
-    local_state_path =
-        local_state_path.Append(FILE_PATH_LITERAL("Local State"));
+        local_state_path.Append(FILE_PATH_LITERAL("ChromeWebViewLocalState"));
 
     scoped_refptr<PersistentPrefStore> user_pref_store =
         new JsonPrefStore(std::move(local_state_path));

ios/web_view/internal/web_view_browser_state.mm

@@ -61,7 +61,8 @@
 #endif
 
 namespace {
-const char kPreferencesFilename[] = FILE_PATH_LITERAL("Preferences");
+const char kPreferencesFilename[] =
+    FILE_PATH_LITERAL("ChromeWebViewPreferences");
 }
 
 namespace ios_web_view {

ios/web_view/internal/web_view_url_request_context_getter.mm

@@ -79,7 +79,7 @@ net::URLRequestContext* WebViewURLRequestContextGetter::GetURLRequestContext() {
     bool cookie_path_found =
         base::PathService::Get(base::DIR_APP_DATA, &cookie_path);
     DCHECK(cookie_path_found);
-    cookie_path = cookie_path.Append("ChromeWebView").Append("Cookies");
+    cookie_path = cookie_path.Append("ChromeWebViewCookies");
     scoped_refptr<net::CookieMonster::PersistentCookieStore> persistent_store =
         new net::SQLitePersistentCookieStore(
             cookie_path, network_task_runner_,
@@ -151,7 +151,8 @@ net::URLRequestContext* WebViewURLRequestContextGetter::GetURLRequestContext() {
     network_session_context.ct_policy_enforcer =
         url_request_context_->ct_policy_enforcer();
 
-    base::FilePath cache_path = base_path_.Append(FILE_PATH_LITERAL("Cache"));
+    base::FilePath cache_path =
+        base_path_.Append(FILE_PATH_LITERAL("ChromeWebViewCache"));
     std::unique_ptr<net::HttpCache::DefaultBackend> main_backend(
         new net::HttpCache::DefaultBackend(
             net::DISK_CACHE, net::CACHE_BACKEND_DEFAULT, cache_path, 0));