Export content_common dependency from some content targets.

content/content.gyp

Index: content/content.gyp
diff --git a/content/content.gyp b/content/content.gyp
index 6d5430c808450d13564a5227c52b3a88248f917c..3d52d9d5696fecdfc74004992ae42c9e6f3e601c 100644
--- a/content/content.gyp
+++ b/content/content.gyp
@@ -46,6 +46,9 @@
             'content_browser',
             'content_common',
           ],
+          'export_dependent_settings': [
+            'content_common',
+          ],
           'conditions': [
             ['OS != "ios"', {
               'dependencies': [
@@ -70,6 +73,9 @@
           'dependencies': [
             'content_common',
           ],
+          'export_dependent_settings': [
+            'content_common',
+          ],
           'conditions': [
             ['chrome_multiple_dll', {
               'defines': [
@@ -88,6 +94,9 @@
           'dependencies': [
             'content_common',
           ],
+          'export_dependent_settings': [
+            'content_common',
+          ],
           'conditions': [
             ['chrome_multiple_dll', {
               'defines': [
@@ -121,6 +130,9 @@
             'content_common',
             'content_resources.gyp:content_resources',
           ],
+          'export_dependent_settings': [
+            'content_common',
+          ],
           'conditions': [
             ['java_bridge==1', {
               'dependencies': [