Revert 260917 "Media Galleries API Metadata: Image metadata"

> Media Galleries API Metadata: Image metadata
> 
> Enables libexif and uses it to parse some image tags into the GetMetadata call.
> 
> BUG=318450
> 
> Review URL: https://codereview.chromium.org/191583002

TBR=tommycli@chromium.org

Review URL: https://codereview.chromium.org/217233005

git-svn-id: http://src.chromium.org/svn/trunk/src/build@260931 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

common.gypi

@@ -2243,14 +2243,6 @@
       }, {  # else: branding!="Chrome"
         'defines': ['CHROMIUM_BUILD'],
       }],
-      ['OS=="mac"', {
-        'xcode_settings': {
-          'LD_RUNPATH_SEARCH_PATHS': [
-            # To find dylibs such as libexif.
-            '@loader_path/.',
-          ],
-        },
-      }],
       ['OS=="mac" and component=="shared_library"', {
         'xcode_settings': {
           'DYLIB_INSTALL_NAME_BASE': '@rpath',