Revert of Media Galleries Partial Deprecation: Remove image metadata & libexif.

third_party/libexif/README.chromium

Index: third_party/libexif/README.chromium
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+Name: libexif
+URL: http://libexif.sourceforge.net/
+Version: 0.6.21
+License: LGPL 2.1
+License File: sources/COPYING
+Date: 2012-06-04
+Security Critical: yes
+
+Description:
+libexif is a library for parsing, editing, and saving EXIF data. Many maker
+notes from Canon, Casio, Epson, Fuji, Nikon, Olympus, Pentax and Sanyo cameras
+are also supported.
+
+Local Modifications:
+- Added license header to exif-mem.c. Please refer to chromium.patch.
+- config.h and _stdint.h has been modified to build on all platforms. Please
+  refer to chromium.patch.
+- Added BIND_TEXTDOMAIN macro to conditionally bind the text domain to locale
+  directory. Please refer to chromium.patch.
+- Removed ABOUT-NLS, *.m4, *-m4, binary, ChangeLog, config*, contrib, depcomp,
+  INSTALL, install-sh, Makefile-files, *.sym, *.am, *.in, *.pc.in, *.spec, *.sh
+  and *.txt files.
+- Removed "doc", "po", "NEWS", "mkinstalldirs", "missing", "nls" folders.
+- Removed inline from exif_tag_table_count function in exif-tag.c, to build
+  cleanly with MSVC's non-standard inline rules.
+- https://codereview.chromium.org/1585593002