Do not hash mapping field names of a reserved struct.
Do not hash mapping field names of a reserved struct.

With this fixed, Chrome behaves the same on WebGL conformance tests 1.0.2 with/without --enable-shader-name-hashing

BUG=
TEST=WebGL conformance tests
Review URL: https://codereview.appspot.com/7229043

git-svn-id: 947ae547afacb859f3991e003b9d6feb04be57d7@1809 736b8ea6-26fd-11df-bfd4-992fa37f6226

android-ia/platform_external_chromium_org_third_party_angle,MIPS/external-chromium_org-third_party-angle,jgcaaprom/android_external_chromium_org_third_party_angle,geekboxzone/lollipop_external_chromium_org_third_party_angle,MIPS/external-chromium_org-third_party-angle,android-ia/platform_external_chromium_org_third_party_angle,xin3liang/platform_external_chromium_org_third_party_angle,android-ia/platform_external_chromium_org_third_party_angle,xin3liang/platform_external_chromium_org_third_party_angle,spurious/angle-mirror,spurious/angle-mirror,xin3liang/platform_external_chromium_org_third_party_angle,spurious/angle-mirror,jgcaaprom/android_external_chromium_org_third_party_angle,xin3liang/platform_external_chromium_org_third_party_angle,MIPS/external-chromium_org-third_party-angle,jgcaaprom/android_external_chromium_org_third_party_angle,android-ia/platform_external_chromium_org_third_party_angle,geekboxzone/lollipop_external_chromium_org_third_party_angle,geekboxzone/lollipop_external_chromium_org_third_party_angle,MIPS/external-chromium_org-third_party-angle,jgcaaprom/android_external_chromium_org_third_party_angle,spurious/angle-mirror,geekboxzone/lollipop_external_chromium_org_third_party_angle