rename some base _linux files to _posix so that others can use it too

base/base_paths_posix.cc

Index: base/base_paths_posix.cc
diff --git a/base/base_paths_linux.cc b/base/base_paths_posix.cc
similarity index 98%
rename from base/base_paths_linux.cc
rename to base/base_paths_posix.cc
index 36d5ee73ace52b359b189a9dcbb21dec9a29dc02..14d17d638171de2212fe73c49af32a3afda02e26 100644
--- a/base/base_paths_linux.cc
+++ b/base/base_paths_posix.cc
@@ -31,7 +31,7 @@ const char kSelfExe[] = "/proc/self/exe";
 
 // The name of this file relative to the source root. This is used for checking
 // that the source checkout is in the correct place.
-static const char kThisSourceFile[] = "base/base_paths_linux.cc";
+static const char kThisSourceFile[] = "base/base_paths_posix.cc";
 
 bool PathProviderPosix(int key, FilePath* result) {
   FilePath path;