Move webrtc/{base => rtc_base}

This refactoring takes a careful approach to avoid rushing the change:
* stub headers are left in all the old locations of webrtc/base
* existing GN targets are kept and now just forward to the moved ones
  using public_deps.
The only exception to the above is the base_java target and its .java files,
which were moved to webrtc/rtc_base right away since it's not possible
to use public_deps for android_library.
To avoid breaking builds, a temporary Dummy.java file was added to
the new intermediate target in webrtc/rtc_base:base_java as well to avoid
hitting a GN assert in the android_library template.

The above approach should make the transition smooth without breaking
downstream.

A helper script was created (https://codereview.webrtc.org/2879203002/)
and was run like this:
stub-headers.py -s webrtc/base -d webrtc/rtc_base -i 7634
stub-headers.py -s webrtc/base/numerics -d webrtc/rtc_base/numerics -i 7634

Fixed invalid header guards in the following files:
webrtc/base/base64.h
webrtc/base/cryptstring.h
webrtc/base/event.h
webrtc/base/flags.h
webrtc/base/httpbase.h
webrtc/base/httpcommon-inl.h
webrtc/base/httpcommon.h
webrtc/base/httpserver.h
webrtc/base/logsinks.h
webrtc/base/macutils.h
webrtc/base/nattypes.h
webrtc/base/openssladapter.h
webrtc/base/opensslstreamadapter.h
webrtc/base/pathutils.h
webrtc/base/physicalsocketserver.h
webrtc/base/proxyinfo.h
webrtc/base/sigslot.h
webrtc/base/sigslotrepeater.h
webrtc/base/socket.h
webrtc/base/socketaddresspair.h
webrtc/base/socketfactory.h
webrtc/base/stringutils.h
webrtc/base/testbase64.h
webrtc/base/testutils.h
webrtc/base/transformadapter.h
webrtc/base/win32filesystem.h

Added new header guards to:
sslroots.h
testbase64.h

BUG=webrtc:7634
NOTRY=True
NOPRESUBMIT=True
R=kwiberg@webrtc.org

Review-Url: https://codereview.webrtc.org/2877023002 .
Cr-Commit-Position: refs/heads/master@{#18816}
diff --git a/webrtc/base/stringize_macros.h b/webrtc/base/stringize_macros.h
index 7e2f44d..5f8a5b1 100644
--- a/webrtc/base/stringize_macros.h
+++ b/webrtc/base/stringize_macros.h
@@ -18,21 +18,9 @@
 #ifndef WEBRTC_BASE_STRINGIZE_MACROS_H_
 #define WEBRTC_BASE_STRINGIZE_MACROS_H_
 
-// This is not very useful as it does not expand defined symbols if
-// called directly. Use its counterpart without the _NO_EXPANSION
-// suffix, below.
-#define STRINGIZE_NO_EXPANSION(x) #x
 
-// Use this to quote the provided parameter, first expanding it if it
-// is a preprocessor symbol.
-//
-// For example, if:
-//   #define A FOO
-//   #define B(x) myobj->FunctionCall(x)
-//
-// Then:
-//   STRINGIZE(A) produces "FOO"
-//   STRINGIZE(B(y)) produces "myobj->FunctionCall(y)"
-#define STRINGIZE(x) STRINGIZE_NO_EXPANSION(x)
+// This header is deprecated and is just left here temporarily during
+// refactoring. See https://bugs.webrtc.org/7634 for more details.
+#include "webrtc/rtc_base/stringize_macros.h"
 
 #endif  // WEBRTC_BASE_STRINGIZE_MACROS_H_