Declare dependency on blink_headers in targets that use blink headers

content/content.gyp

Index: content/content.gyp
diff --git a/content/content.gyp b/content/content.gyp
index 1d323520b14605031ec98980d038476598d352c6..e8cf19d2321bdb41e5c2d37ba27a5103a2c19757 100644
--- a/content/content.gyp
+++ b/content/content.gyp
@@ -105,6 +105,9 @@
           'dependencies': [
             'content_common',
           ],
+          'export_dependent_settings': [
+            'content_common',
+          ],
         },
         {
           'target_name': 'content_browser',
@@ -299,11 +302,13 @@
           'target_name': 'content_app_both',
           'type': 'none',
           'dependencies': ['content'],
+          'export_dependent_settings': ['content'],
         },
         {
           'target_name': 'content_browser',
           'type': 'none',
           'dependencies': ['content'],
+          'export_dependent_settings': ['content'],
         },
         {
           'target_name': 'content_common',
@@ -311,6 +316,7 @@
           'dependencies': ['content', 'content_resources.gyp:content_resources'],
           # Disable c4267 warnings until we fix size_t to int truncations.
           'msvs_disabled_warnings': [ 4267, ],
+          'export_dependent_settings': ['content'],
         },
         {
           'target_name': 'content_child',
@@ -343,6 +349,7 @@
           'target_name': 'content_utility',
           'type': 'none',
           'dependencies': ['content'],
+          'export_dependent_settings': ['content'],
         },
         {
           'target_name': 'content_worker',