Include-what-you-use related to logging.h (google_apis)

Add direct includes for things provided transitively by logging.h
(or by other headers including logging.h).

This is in preparation for cleaning up unnecessary includes of
logging.h in header files (so if something depends on logging.h,
it needs include it explicitly), and for when logging.h no longer
includes check.h, check_op.h, and notreached.h.

Bug: 1031540
Change-Id: I232b5159e7816b2f2bb640ede69bed7fac7a75da
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2248630
Commit-Queue: Hans Wennborg <hans@chromium.org>
Commit-Queue: David Roger <droger@chromium.org>
Auto-Submit: Hans Wennborg <hans@chromium.org>
Reviewed-by: David Roger <droger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#779342}

google_apis/gcm/engine/gservices_settings.cc

@@ -9,6 +9,7 @@
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/hash/sha1.h"
+#include "base/logging.h"
 #include "base/stl_util.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_util.h"

google_apis/google_api_keys.cc

@@ -10,6 +10,7 @@
 #include <stddef.h>
 
 #include <memory>
+#include <string>
 
 #include "base/command_line.h"
 #include "base/environment.h"

google_apis/google_api_keys_mac_unittest.mm

@@ -32,6 +32,7 @@
 #include <string>
 #include "base/command_line.h"
 #include "base/lazy_instance.h"
+#include "base/logging.h"
 #include "base/strings/stringize_macros.h"
 #include "google_apis/google_api_keys_mac.h"
 

google_apis/google_api_keys_unittest.cc

@@ -37,6 +37,7 @@
 #include <string>
 #include "base/command_line.h"
 #include "base/lazy_instance.h"
+#include "base/logging.h"
 #include "base/strings/stringize_macros.h"
 
 #if defined(OS_MACOSX)