Create webrtc/base/objc and move some logging code there

webrtc/base/objc/RTCLogging.h

Index: webrtc/base/objc/RTCLogging.h
diff --git a/talk/app/webrtc/objc/public/RTCLogging.h b/webrtc/base/objc/RTCLogging.h
similarity index 52%
copy from talk/app/webrtc/objc/public/RTCLogging.h
copy to webrtc/base/objc/RTCLogging.h
index bcd160d921292c36a903f586071750ba8a665dc8..19fade5cfc7b8ccee5c21252ffdba8931741482c 100644
--- a/talk/app/webrtc/objc/public/RTCLogging.h
+++ b/webrtc/base/objc/RTCLogging.h
@@ -1,28 +1,11 @@
 /*
- * libjingle
- * Copyright 2015 Google Inc.
+ *  Copyright 2015 The WebRTC project authors. All Rights Reserved.
  *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
- *
- *  1. Redistributions of source code must retain the above copyright notice,
- *     this list of conditions and the following disclaimer.
- *  2. Redistributions in binary form must reproduce the above copyright notice,
- *     this list of conditions and the following disclaimer in the documentation
- *     and/or other materials provided with the distribution.
- *  3. The name of the author may not be used to endorse or promote products
- *     derived from this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
- * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
- * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
- * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
- * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
- * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
- * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
- * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
  */
 
 #import <Foundation/Foundation.h>
@@ -36,14 +19,14 @@ typedef NS_ENUM(NSInteger, RTCLoggingSeverity) {
 };
 
 #if defined(__cplusplus)
-extern "C" void RTCLogEx(RTCLoggingSeverity severity, NSString* logString);
+extern "C" void RTCLogEx(RTCLoggingSeverity severity, NSString* log_string);
 extern "C" void RTCSetMinDebugLogLevel(RTCLoggingSeverity severity);
 extern "C" NSString* RTCFileName(const char* filePath);
 #else
 
 // Wrapper for C++ LOG(sev) macros.
 // Logs the log string to the webrtc logstream for the given severity.
-extern void RTCLogEx(RTCLoggingSeverity severity, NSString* logString);
+extern void RTCLogEx(RTCLoggingSeverity severity, NSString* log_string);
 
 // Wrapper for rtc::LogMessage::LogToDebug.
 // Sets the minimum severity to be logged to console.
@@ -63,10 +46,10 @@ extern NSString* RTCFileName(const char* filePath);
       __FUNCTION__,                                  \
       ##__VA_ARGS__]
 
-#define RTCLogFormat(severity, format, ...)                    \
-  do {                                                         \
-    NSString *logString = RTCLogString(format, ##__VA_ARGS__); \
-    RTCLogEx(severity, logString);                             \
+#define RTCLogFormat(severity, format, ...)                     \
+  do {                                                          \
+    NSString* log_string = RTCLogString(format, ##__VA_ARGS__); \
+    RTCLogEx(severity, log_string);                             \
   } while (false)
 
 #define RTCLogVerbose(format, ...)                                \