Upgrade extensions from deprecated base::JSONReader API

Bug: 1070409
Change-Id: I239951e64680698954f97583255382227c2bde3c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2228631Reviewed-by: Reilly Grant <reillyg@chromium.org>
Commit-Queue: Nigel Tao <nigeltao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#775051}

chrome/browser/extensions/background_header_browsertest.cc

@@ -68,8 +68,8 @@ class BackgroundHeaderTest : public ExtensionBrowserTest {
         content::JsReplace("executeFetch($1);", url));
     std::string json;
     EXPECT_TRUE(message_queue.WaitForMessage(&json));
-    base::JSONReader reader(base::JSON_ALLOW_TRAILING_COMMAS);
-    base::Optional<base::Value> value = reader.ReadToValue(json);
+    base::Optional<base::Value> value =
+        base::JSONReader::Read(json, base::JSON_ALLOW_TRAILING_COMMAS);
     std::string result;
     if (!value) {
       ADD_FAILURE() << "Received invalid response: " << json;

extensions/browser/value_store/lazy_leveldb.cc

@@ -102,7 +102,7 @@ ValueStore::Status LazyLevelDb::Read(const std::string& key,
     return ToValueStoreError(s);
 
   base::Optional<base::Value> read_value =
-      base::JSONReader().ReadToValue(value_as_json);
+      base::JSONReader::Read(value_as_json);
   if (!read_value) {
     return ValueStore::Status(ValueStore::CORRUPTION, FixCorruption(&key),
                               kInvalidJson);