Attempt to silence signed/unsigned warnings in android build.
Review URL: https://codereview.chromium.org/13168003

git-svn-id: http://skia.googlecode.com/svn/trunk@8434 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/gpu/gl/GrGLCaps.cpp b/src/gpu/gl/GrGLCaps.cpp
index 1f3cf16..461b3d6 100644
--- a/src/gpu/gl/GrGLCaps.cpp
+++ b/src/gpu/gl/GrGLCaps.cpp
@@ -462,7 +462,7 @@
 #if !GR_GL_CHECK_FBO_STATUS_ONCE_PER_FORMAT
     return;
 #endif
-    GrAssert((unsigned)config < kGrPixelConfigCnt);
+    GrAssert((unsigned)config < (unsigned)kGrPixelConfigCnt);
     GrAssert(fStencilFormats.count() == fStencilVerifiedColorConfigs.count());
     int count = fStencilFormats.count();
     // we expect a really small number of possible formats so linear search
@@ -485,7 +485,7 @@
 #if !GR_GL_CHECK_FBO_STATUS_ONCE_PER_FORMAT
     return false;
 #endif
-    GrAssert((unsigned)config < kGrPixelConfigCnt);
+    GrAssert((unsigned)config < (unsigned)kGrPixelConfigCnt);
     int count = fStencilFormats.count();
     // we expect a really small number of possible formats so linear search
     // should be OK