Revert "Add header for opting into correct URL decoding (#186)" (#232)

This reverts commit 8124282.

Author: rockwotj

db/db.go

@@ -114,7 +114,6 @@ func (c *Client) send(
 	if c.authOverride != "" {
 		opts = append(opts, internal.WithQueryParam(authVarOverride, c.authOverride))
 	}
-	opts = append(opts, internal.WithHeader("X-Firebase-Decoding", "1"))
 	return c.hc.Do(ctx, &internal.Request{
 		Method: method,
 		URL:    fmt.Sprintf("%s%s.json", c.url, path),

db/db_test.go

@@ -275,9 +275,6 @@ func checkRequest(t *testing.T, got, want *testReq) {
 	if h := got.Header.Get("Authorization"); h != "Bearer mock-token" {
 		t.Errorf("Authorization = %q; want = %q", h, "Bearer mock-token")
 	}
-	if h := got.Header.Get("X-Firebase-Decoding"); h != "1" {
-		t.Errorf("X-Firebase-Decoding = %q; want = %q", h, "1")
-	}
 	if h := got.Header.Get("User-Agent"); h != testUserAgent {
 		t.Errorf("User-Agent = %q; want = %q", h, testUserAgent)
 	}