Fixed error message for exceeding maximum struct nesting.
Fixed error message for exceeding maximum struct nesting.

It got broken in r2423.
We were referring to field-name as struct-name.
This patch fixes the regression and also improves the error message
by adding the field-name.

BUG=459
R=kbr@chromium.org

Review URL: https://codereview.appspot.com/12891043

xin3liang/platform_external_chromium_org_third_party_angle_dx11,cvsuser-chromium/chromium-third-party_angle_dx11,RepublicMaster/angleproject,xin3liang/platform_external_chromium_org_third_party_angle,pombreda/angleproject,shairai/angleproject,MIPS/external-chromium_org-third_party-angle,shairai/angleproject,android-ia/platform_external_chromium_org_third_party_angle,vvuk/angle-old,geekboxzone/lollipop_external_chromium_org_third_party_angle,themusicgod1/angleproject,cantren/angleproject,cvsuser-chromium/chromium-third-party_angle_dx11,xin3liang/platform_external_chromium_org_third_party_angle_dx11,KalebDark/angleproject,xin3liang/platform_external_chromium_org_third_party_angle_dx11,RepublicMaster/angleproject,android-ia/platform_external_chromium_org_third_party_angle,MIPS/external-chromium_org-third_party-angle,ehsan/angle,geekboxzone/lollipop_external_chromium_org_third_party_angle,geekboxzone/lollipop_external_chromium_org_third_party_angle,pombreda/angleproject,xin3liang/platform_external_chromium_org_third_party_angle,xuxiandi/angleproject,cvsuser-chromium/chromium-third-party_angle_dx11,xin3liang/platform_external_chromium_org_third_party_angle,jgcaaprom/android_external_chromium_org_third_party_angle,jgcaaprom/android_external_chromium_org_third_party_angle,themusicgod1/angleproject,themusicgod1/angleproject,cantren/angleproject,vvuk/angle-old,xuxiandi/angleproject,KalebDark/angleproject,KalebDark/angleproject,cvsuser-chromium/chromium-third-party_angle_dx11,android-ia/platform_external_chromium_org_third_party_angle,KalebDark/angleproject,pombreda/angleproject,RepublicMaster/angleproject,ehsan/angle,xin3liang/platform_external_chromium_org_third_party_angle_dx11,android-ia/platform_external_chromium_org_third_party_angle,ehsan/angle,pombreda/angleproject,xuxiandi/angleproject,cantren/angleproject,MIPS/external-chromium_org-third_party-angle,xuxiandi/angleproject,ehsan/angle,cantren/angleproject,xin3liang/platform_external_chromium_org_third_party_angle,geekboxzone/lollipop_external_chromium_org_third_party_angle,jgcaaprom/android_external_chromium_org_third_party_angle,RepublicMaster/angleproject,shairai/angleproject,MIPS/external-chromium_org-third_party-angle,shairai/angleproject,jgcaaprom/android_external_chromium_org_third_party_angle,vvuk/angle-old,themusicgod1/angleproject,vvuk/angle-old