Disable WebShare on platforms other than android.

third_party/WebKit/Source/build/scripts/templates/OriginTrials.cpp.tmpl

Index: third_party/WebKit/Source/build/scripts/templates/OriginTrials.cpp.tmpl
diff --git a/third_party/WebKit/Source/build/scripts/templates/OriginTrials.cpp.tmpl b/third_party/WebKit/Source/build/scripts/templates/OriginTrials.cpp.tmpl
index 2f16adf781b1b19f52c41d4bd00ee23aae6ebcf2..7c3d75b29ad22a9cd6fc10380eff06a053c240e3 100644
--- a/third_party/WebKit/Source/build/scripts/templates/OriginTrials.cpp.tmpl
+++ b/third_party/WebKit/Source/build/scripts/templates/OriginTrials.cpp.tmpl
@@ -14,8 +14,21 @@ namespace blink {
 bool OriginTrials::{{feature.first_lowered_name}}Enabled(ExecutionContext* executionContext) {
     if (RuntimeEnabledFeatures::{{feature.first_lowered_name}}Enabled())
         return true;
+{% if feature.origin_trial_os_whitelist %}
+#if
+{%- for os in feature.origin_trial_os_whitelist %}
+{%- if not loop.first %} ||{% endif %}
+ defined(OS_{{os | upper}})
+{%- endfor %}
+{% endif %}
+
     OriginTrialContext* context = OriginTrialContext::from(executionContext, OriginTrialContext::DontCreateIfNotExists);
     return context && context->isFeatureEnabled("{{feature.origin_trial_feature_name}}");
+{% if feature.origin_trial_os_whitelist %}
+#else
+    return false;
+#endif
+{% endif %}
 }
 
 {% endif %}